Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"(®)(?!([^\"<>]*\"(\s\s*[\w-]+=\"[^<>]*>|\s*\/?>)))" test_str = ("<html itemscope=\"\" itemtype=\"http://schema.org/QAPage\"><head>\n\n" "<title>php - Increase regex performance when matching only if not in html attribute - Stack Overflow</title>\n" " <link rel=\"shortcut icon\" href=\"//cdn.sstatic.net/Sites/stackoverflow/img/favicon.ico?v=4f32ecc8f43d\">\n" " <link rel=\"apple-touch-icon image_src\" href=\"//cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon.png?v=c78bd457575a\">\n" " <link rel=\"search\" type=\"application/opensearchdescription+xml\" title=\"Stack Overflow\" href=\"/opensearch.xml\">\n" " <meta name=\"twitter:card\" content=\"summary\">\n" " <meta name=\"twitter:domain\" content=\"stackoverflow.com\">\n" " <meta property=\"og:type\" content=\"website\">\n\n" " <meta property=\"og:image\" itemprop=\"image primaryImageOfPage\" content=\"http://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon@2.png?v=73d79a89bded&amp;a\">\n" " <meta name=\"twitter:title\" property=\"og:title\" itemprop=\"title name\" content=\"Increase regex performance when matching only if not in html attribute\">\n" " <meta name=\"twitter:description\" property=\"og:description\" itemprop=\"description\" content=\"TYPO3 blocks rendering of pages with more than 13 content-elements when using the Typoscript:\n\n" "brandReplacing {\n" " stdWrap {\n" " replacement {\n" " 10 {\n" " search = ®(?=[&amp;l...\">\n" " <meta property=\"og:url\" content=\"http://stackoverflow.com/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\">\n" " <link rel=\"canonical\" href=\"http://stackoverflow.com/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\">\n\n" " \n" " \n" " <script type=\"text/javascript\" async=\"\" src=\"http://engine.adzerk.net/ados?t=1473846550845&amp;request={&quot;Placements&quot;:[{&quot;A&quot;:22,&quot;S&quot;:8277,&quot;D&quot;:&quot;adzerk1407900611&quot;,&quot;ATA&quot;:[5,17,2221],&quot;Z&quot;:[45]}],&quot;Keywords&quot;:&quot;php%2Chtml%2Cregex%2Ctypo3%2Cx-user-registered%2Cx-200plus-rep&quot;,&quot;Referrer&quot;:&quot;http%3A%2F%2Fstackoverflow.com%2Fposts%2F39486767%2Fedit&quot;,&quot;IsAsync&quot;:true}\"></script><script async=\"\" src=\"http://edge.quantserve.com/quant.js\"></script><script async=\"\" src=\"http://b.scorecardresearch.com/beacon.js\"></script><script async=\"\" src=\"https://www.google-analytics.com/analytics.js\"></script><script type=\"text/javascript\" async=\"\" src=\"http://static.adzerk.net/ados.js\"></script><script src=\"//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js\"></script>\n" " <script src=\"//cdn.sstatic.net/Js/stub.en.js?v=ac13456bebd7\"></script>\n" " <link rel=\"stylesheet\" type=\"text/css\" href=\"//cdn.sstatic.net/Sites/stackoverflow/all.css?v=5623d8beefda\">\n\n" " <link rel=\"alternate\" type=\"application/atom+xml\" title=\"Feed for question 'Increase regex performance when matching only if not in html attribute'\" href=\"/feeds/question/39486767\">\n" " <meta name=\"twitter:app:country\" content=\"US\">\n" " <meta name=\"twitter:app:name:iphone\" content=\"Stack Exchange iOS\">\n" " <meta name=\"twitter:app:id:iphone\" content=\"871299723\">\n" " <meta name=\"twitter:app:url:iphone\" content=\"se-zaphod://stackoverflow.com/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\">\n" " <meta name=\"twitter:app:name:ipad\" content=\"Stack Exchange iOS\">\n" " <meta name=\"twitter:app:id:ipad\" content=\"871299723\">\n" " <meta name=\"twitter:app:url:ipad\" content=\"se-zaphod://stackoverflow.com/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\">\n" " <meta name=\"twitter:app:name:googleplay\" content=\"Stack Exchange Android\">\n" " <meta name=\"twitter:app:url:googleplay\" content=\"http://stackoverflow.com/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\">\n" " <meta name=\"twitter:app:id:googleplay\" content=\"com.stackexchange.marvin\">\n" " <script>\n" " \n" " StackExchange.ready(function () {\n" " \n" " StackExchange.using(\"snippets\", function () {\n" " StackExchange.snippets.initSnippetRenderer();\n" " });\n" " \n\n" " StackExchange.using(\"postValidation\", function () {\n" " StackExchange.postValidation.initOnBlurAndSubmit($('#post-form'), 2, 'answer');\n" " });\n\n" " \n" " StackExchange.question.init({votesCast:[],totalCommentCount:5,shownCommentCount:5,highlightColor:'#F4A83D',backgroundColor:'#FFF',questionId:39486767});\n\n" " styleCode();\n\n" " StackExchange.realtime.subscribeToQuestion('1', '39486767');\n" " StackExchange.using(\"gps\", function () { StackExchange.gps.trackOutboundClicks('#content', '.post-text'); });\n\n" " });\n" " </script>\n\n\n" " <script>\n" " StackExchange.ready(function () {\n" " StackExchange.realtime.init('wss://qa.sockets.stackexchange.com,ws://qa.sockets.stackexchange.com');\n" " StackExchange.realtime.subscribeToReputationNotifications('1');\n" " StackExchange.realtime.subscribeToTopBarNotifications('1');\n" " });\n" " </script>\n" " <script>\n" " StackExchange.init({\"locale\":\"en\",\"stackAuthUrl\":\"https://stackauth.com\",\"networkMetaHostname\":\"meta.stackexchange.com\",\"serverTime\":1473846547,\"routeName\":\"Questions/Show\",\"site\":{\"name\":\"Stack Overflow\",\"description\":\"Q&A for professional and enthusiast programmers\",\"isNoticesTabEnabled\":true,\"recaptchaPublicKey\":\"6LdchgIAAAAAAJwGpIzRQSOFaO0pU6s44Xt8aTwc\",\"recaptchaAudioLang\":\"en\",\"enableNewTagCreationWarning\":true,\"insertSpaceAfterNameTabCompletion\":false,\"id\":1,\"enableInsertDocLinkDialog\":true,\"enableSocialMediaInSharePopup\":true},\"user\":{\"fkey\":\"163fdb769ceeb49041bd469392682033\",\"rep\":219,\"isRegistered\":true,\"userType\":3,\"userId\":5422107,\"accountId\":7085060,\"gravatar\":\"<div class=\\\"gravatar-wrapper-32\\\"><img src=\\\"https://i.stack.imgur.com/DobWy.png?s=32&amp;g=1\\\" alt=\\\"\\\" width=\\\"32\\\" height=\\\"32\\\"></div>\",\"profileUrl\":\"http://stackoverflow.com/users/5422107/y-hermes\",\"canSeeDeletedPosts\":false},\"realtime\":{\"newest\":false,\"active\":false,\"tagged\":true,\"workerIframeDomain\":\"http://cdn.sstatic.net\"}}, {\"site\":{\"allowImageUploads\":true,\"enableUserHovercards\":true,\"styleCode\":true,\"enableNewLinkInsertDialog\":true},\"tags\":{},\"accounts\":{\"currentPasswordRequiredForChangingStackIdPassword\":true},\"flags\":{\"allowRetractingFlags\":true},\"snippets\":{\"snippetsEnabled\":true,\"renderDomain\":\"stacksnippets.net\"},\"markdown\":{\"asteriskIntraWordEmphasis\":true}});\n" " StackExchange.using.setCacheBreakers({\"js/prettify-full.en.js\":\"0696d93dfb99\",\"js/moderator.en.js\":\"d53fcdd08c4f\",\"js/full-anon.en.js\":\"04ad440fa4dc\",\"js/full.en.js\":\"cee04076d19a\",\"js/wmd.en.js\":\"65dfb5f8de64\",\"js/third-party/jquery.autocomplete.min.js\":\"e5f01e97f7c3\",\"js/third-party/jquery.autocomplete.min.en.js\":\"\",\"js/mobile.en.js\":\"89c3667c46bc\",\"js/help.en.js\":\"dbd4f489eff2\",\"js/tageditor.en.js\":\"4af7bd263513\",\"js/tageditornew.en.js\":\"96cd569991ad\",\"js/inline-tag-editing.en.js\":\"a815357d00cd\",\"js/revisions.en.js\":\"cf90cfea0ccf\",\"js/review.en.js\":\"18568da9a695\",\"js/tagsuggestions.en.js\":\"78eee7c19ab2\",\"js/post-validation.en.js\":\"991865b0743e\",\"js/explore-qlist.en.js\":\"e71f14781288\",\"js/events.en.js\":\"76fdd1d3b88a\",\"js/keyboard-shortcuts.en.js\":\"4565f1531be4\",\"js/external-editor.en.js\":\"93769406446f\",\"js/external-editor.en.js\":\"93769406446f\",\"js/snippet-javascript.en.js\":\"cc5508c2e17e\",\"js/snippet-javascript-codemirror.en.js\":\"6d0763e65794\"});\n" " StackExchange.using(\"gps\", function() {\n" " StackExchange.gps.init(true);\n" " });\n" " </script>\n" " \n" "<script async=\"\" src=\"//cdn.sstatic.net/Js/full.en.js?v=cee04076d19a\"></script><script async=\"\" src=\"//cdn.sstatic.net/Js/snippet-javascript.en.js?v=cc5508c2e17e\"></script><script async=\"\" src=\"//cdn.sstatic.net/Js/post-validation.en.js?v=991865b0743e\"></script><script async=\"\" src=\"//cdn.sstatic.net/Js/prettify-full.en.js?v=0696d93dfb99\"></script><script async=\"\" src=\"//cdn.sstatic.net/Js/external-editor.en.js?v=93769406446f\"></script><script async=\"\" src=\"//cdn.sstatic.net/Js/wmd.en.js?v=65dfb5f8de64\"></script><script type=\"text/javascript\" src=\"http://static.adzerk.net/Extensions/adFeedback.js\"></script><link rel=\"stylesheet\" href=\"http://static.adzerk.net/Extensions/adFeedback.css\"><link type=\"text/css\" rel=\"stylesheet\" href=\"//cdn.sstatic.net/clc/styles/clc/jobs-multi.min.css?v=bf2a9ba1db72\"></head>\n" "<body class=\"question-page new-topbar\">\n" " <noscript>&lt;div id=\"noscript-padding\"&gt;&lt;/div&gt;</noscript>\n" " \n\n\n\n" " <div id=\"notify-container\"></div>\n" " <div id=\"custom-header\"></div>\n\n\n\n\n\n" "<div class=\"topbar\">\n" " <div class=\"topbar-wrapper\">\n\n" " <div class=\"js-topbar-dialog-corral\">\n\n\n" "<div class=\"topbar-dialog siteSwitcher-dialog dno\">\n" " <div class=\"header\">\n" " <h3><a href=\"//stackoverflow.com\">current community</a></h3>\n" " </div>\n" " <div class=\"modal-content current-site-container\">\n" " <ul class=\"current-site\">\n" " <li>\n" " <div class=\"related-links\">\n" " <a href=\"http://chat.stackoverflow.com\" class=\"js-gps-track\" data-gps-track=\"site_switcher.click({ item_type:6 })\">chat</a>\n" " <a href=\"/users/logout\" class=\"js-gps-track\" data-gps-track=\"site_switcher.click({ item_type:8 })\">log out</a>\n" " </div>\n\n\n\n\n" " <a href=\"//stackoverflow.com\" class=\"current-site-link site-link js-gps-track\" data-id=\"1\" data-gps-track=\"\n" " site_switcher.click({ item_type:3 })\">\n" " <div class=\"site-icon favicon favicon-stackoverflow\" title=\"Stack Overflow\"></div>\n" " Stack Overflow\n" " </a>\n\n" " </li>\n" " <li class=\"related-site\">\n" " <div class=\"L-shaped-icon-container\">\n" " <span class=\"L-shaped-icon\"></span>\n" " </div>\n\n" " \n\n\n\n" " <a href=\"http://meta.stackoverflow.com\" class=\"site-link js-gps-track\" data-id=\"552\" data-gps-track=\"\n" " site.switch({ target_site:552, item_type:3 }),\n" " site_switcher.click({ item_type:4 })\">\n" " <div class=\"site-icon favicon favicon-stackoverflowmeta\" title=\"Meta Stack Overflow\"></div>\n" " Meta Stack Overflow\n" " </a>\n\n" " </li>\n" " </ul>\n" " </div>\n" " <div class=\"header\" id=\"your-communities-header\">\n" " <h3>\n" " <a href=\"//stackexchange.com/users/7085060/?tab=accounts\">your communities</a>\n" " </h3>\n" " \n" " <a href=\"#\" id=\"edit-pinned-sites\">edit</a>\n" " <a href=\"#\" id=\"cancel-pinned-sites\" style=\"display: none;\">cancel</a>\n" " </div>\n" " <div class=\"modal-content\" id=\"your-communities-section\">\n" " \n" " <ul class=\"my-sites\">\n" " <li>\n" " \n\n\n\n" " <a href=\"//stackoverflow.com\" class=\"site-link js-gps-track\" data-id=\"1\" data-gps-track=\"\n" " site.switch({ target_site:1, item_type:3 }),\n" " site_switcher.click({ item_type:1 })\">\n" " <div class=\"site-icon favicon favicon-stackoverflow\" title=\"Stack Overflow\"></div>\n" " Stack Overflow\n" " <span class=\"rep-score\">219</span>\n" " </a>\n\n" " </li>\n" " </ul>\n" " <div class=\"pinned-site-editor-container\" style=\"display: none;\">\n" " <input id=\"js-site-search-txt\" type=\"text\" class=\"site-filter-input\" value=\"\" placeholder=\"Add a Stack Exchange community\">\n" " <input type=\"submit\" id=\"pin-site-btn\" value=\"Add\" disabled=\"disabled\">\n" " <ul class=\"js-found-sites found-sites\"></ul>\n" " <ul class=\"pinned-site-list sortable\" data-custom-list=\"False\">\n" " </ul>\n" " <input type=\"submit\" value=\"Save\" id=\"save-pinned-sites-btn\" disabled=\"disabled\">\n" " <a href=\"#\" id=\"reset-pinned-sites\">reset to default list</a>\n" " </div>\n" " </div>\n" " <div class=\"header\">\n" " <h3><a href=\"//stackexchange.com/sites\">more stack exchange communities</a></h3>\n" " <a href=\"http://blog.stackoverflow.com\" class=\"fr\">company blog</a>\n" " </div>\n" " <div class=\"modal-content\">\n" " <div class=\"child-content\"></div>\n" " </div>\n" "</div>\n" " </div>\n\n" " <div class=\"network-items\">\n" " <a href=\"//stackexchange.com\" class=\"topbar-icon icon-site-switcher yes-hover js-site-switcher-button js-gps-track\" data-gps-track=\"site_switcher.show\" title=\"A list of all 161 Stack Exchange sites\">\n" " <span class=\"hidden-text\">Stack Exchange</span>\n" " </a>\n\n" " <a href=\"#\" class=\"topbar-icon icon-inbox yes-hover js-inbox-button\" title=\"You have unread inbox messages\">\n" " <span class=\"hidden-text\">Inbox</span>\n" " <span class=\"unread-count\" style=\"display: inline-block;\">2</span>\n" " </a>\n" " <a href=\"#\" class=\"topbar-icon icon-achievements yes-hover js-achievements-button\" data-unread-class=\"\" title=\"Recent achievements: reputation, badges, and privileges earned\">\n" " <span class=\"hidden-text\">Reputation and Badges</span>\n" " <span class=\"unread-count\" style=\"display:none\">\n" " \n" " </span>\n" " </a>\n" " </div>\n\n" " <div class=\"topbar-links\">\n\n" " <a href=\"/users/5422107/y-hermes\" class=\"profile-me js-gps-track\" data-gps-track=\"profile_summary.click()\">\n" " \n" " <div class=\"gravatar-wrapper-24\" title=\"Y.Hermes\"><img src=\"https://i.stack.imgur.com/DobWy.png?s=48&amp;g=1\" alt=\"\" width=\"24\" height=\"24\" class=\"avatar-me js-avatar-me\"></div>\n\n" " <div class=\"links-container topbar-flair\">\n\n" " <span class=\"reputation\" title=\"your reputation: 219\">\n" " 219\n" " </span>\n" "<span title=\"1 silver badge\"><span class=\"badge2\"></span><span class=\"badgecount\">1</span></span><span title=\"17 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">17</span></span> </div>\n" " </a>\n" " <div class=\"links-container\">\n" " <span class=\"topbar-menu-links\">\n\n\n\n" " <a href=\"/review\" title=\"Review queues - help improve the site\">\n" " review\n" " </a>\n\n" " <a href=\"#\" class=\"icon-help js-help-button\" title=\"Help Center and other resources\">\n" " help\n" " <span class=\"triangle\"></span>\n" " </a>\n" " <div class=\"topbar-dialog help-dialog js-help-dialog dno\">\n" " <div class=\"modal-content\">\n" " <ul>\n" " <li>\n" " <a href=\"/tour\" class=\"js-gps-track\" data-gps-track=\"help_popup.click({ item_type:1 })\">\n" " Tour\n" " <span class=\"item-summary\">\n" " Start here for a quick overview of the site\n" " </span>\n" " </a>\n" " </li>\n" " <li>\n" " <a href=\"/help\" class=\"js-gps-track\" data-gps-track=\"help_popup.click({ item_type:4 })\">\n" " Help Center\n" " <span class=\"item-summary\">\n" " Detailed answers to any questions you might have\n" " </span>\n" " </a>\n" " </li>\n" " <li>\n" " <a href=\"//meta.stackoverflow.com\" class=\"js-gps-track\" data-gps-track=\"help_popup.click({ item_type:2 })\">\n" " Meta\n" " <span class=\"item-summary\">\n" " Discuss the workings and policies of this site\n" " </span>\n" " </a>\n" " </li>\n" " <li>\n" " <a href=\"http://stackoverflow.com/company/about\" class=\"js-gps-track\" data-gps-track=\"help_popup.click({ item_type:6 })\">\n" " About Us\n" " <span class=\"item-summary\">\n" " Learn more about Stack Overflow the company\n" " </span>\n" " </a>\n" " </li>\n" " <li>\n" " <a href=\"http://business.stackoverflow.com/?ref=topbar_help\" class=\"js-gps-track\" data-gps-track=\"help_popup.click({ item_type:7 })\">\n" " Business\n" " <span class=\"item-summary\">\n" " Learn more about hiring developers or posting ads with us\n" " </span>\n" " </a>\n" " </li>\n" " </ul>\n" " </div>\n" " </div>\n" " </span>\n" " </div>\n\n" " <div class=\"search-container\">\n" " <form id=\"search\" action=\"/search\" method=\"get\" autocomplete=\"off\">\n" " <input name=\"q\" type=\"text\" placeholder=\"Search Q&amp;A\" value=\"\" tabindex=\"1\" autocomplete=\"off\" maxlength=\"240\">\n" " </form>\n" " </div>\n\n" " </div>\n" " </div>\n" "</div>\n" " <script>\n" " StackExchange.ready(function() { StackExchange.topbar.init(); });\n" " </script>\n\n" " <div class=\"container\">\n" " <div id=\"header\">\n" " <br class=\"cbt\">\n" " <div id=\"hlogo\">\n" " <a href=\"/\">\n" " Stack Overflow\n" " </a>\n" " </div>\n" " <div id=\"hmenus\">\n" " <div class=\"nav mainnavs\">\n" " <ul>\n" " <li class=\"youarehere\"><a id=\"nav-questions\" href=\"/questions\">Questions</a></li>\n" " <li><a id=\"nav-jobs\" href=\"/jobs?med=site-ui&amp;ref=jobs-tab\">Jobs</a></li>\n" " <li><a id=\"nav-docs\" href=\"/documentation\">Documentation</a></li>\n" " <li><a id=\"nav-tags\" href=\"/tags\">Tags</a></li>\n" " <li><a id=\"nav-users\" href=\"/users\">Users</a></li>\n" " <li><a id=\"nav-badges\" href=\"/help/badges\">Badges</a></li>\n" " </ul>\n" " </div>\n" " <div class=\"nav askquestion\">\n" " <ul>\n" " <li>\n" " <a id=\"nav-askquestion\" href=\"/questions/ask\">Ask Question</a>\n" " </li>\n" " </ul>\n" " </div>\n" " </div>\n" " </div>\n" " \n\n\n\n" " <div id=\"content\" class=\"snippet-hidden\">\n" " \n\n" "<div itemscope=\"\" itemtype=\"http://schema.org/Question\">\n" " <link itemprop=\"image\" href=\"//cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon.png?v=c78bd457575a\">\n" "<div class=\"hero-box docs-announcement\">\n" " <div class=\"hero-close js-dismiss\">Dismiss</div>\n" " \n" " \n" " <div class=\"hero-content text-left\">\n" " <div class=\"text-wrapper\">\n" " <div class=\"hero-title\">\n" " Announcing Stack Overflow Documentation\n" " </div>\n\n" " <p class=\"subtitle\">\n" " We started with Q&amp;A. Technical documentation is next, and we need your help.\n" " </p>\n" " <p class=\"subtitle\">\n" " Whether you're a beginner or an experienced developer, you <i>can</i> contribute.\n" " </p>\n" " </div>\n\n" " <a href=\"/tour/documentation\" class=\"btn js-gps-track\" data-gps-track=\"docs.hero.clicked({target: 1 })\">\n" " I want to help →\n" " </a>\n\n" " <div class=\"img\"></div>\n" " </div>\n" "</div>\n\n" "<script>\n" " StackExchange.ready(function() {\n" " var location = 0;\n" " if ($(\"body\").hasClass(\"question-page\")) {\n" " location = 2;\n" " } else if ($(\"body\").hasClass(\"home-page\")) {\n" " location = 1;\n" " }\n\n" " $(\".docs-announcement .js-dismiss\").one(\"click\", function() {\n" " $(\".docs-announcement\").fadeOut(\"fast\");\n" " $.post(\"/dismiss-documentation-hero\", { fkey: StackExchange.options.user.fkey, location: location });\n" " });\n\n" " StackExchange.using(\"gps\", function () {\n" " StackExchange.gps.track(\"docs.hero.show\", { location: location }, true);\n" " });\n" " });\n" "</script> <div id=\"question-header\">\n" " <h1 itemprop=\"name\"><a href=\"/questions/39486767/increase-regex-performance-when-matching-only-if-not-in-html-attribute\" class=\"question-hyperlink\">Increase regex performance when matching only if not in html attribute</a></h1>\n" " </div>\n" " <div id=\"mainbar\">\n\n" " \n\n" "<div class=\"question\" data-questionid=\"39486767\" id=\"question\">\n\n" " <input type=\"hidden\" id=\"39486767-only-allow-inform-moderator-flagging\" value=\"true\">\n" " <table>\n" " <tbody><tr>\n" " <td class=\"votecell\">\n" " \n\n" "<div class=\"vote\">\n" " <input type=\"hidden\" name=\"_id_\" value=\"39486767\">\n" " <a class=\"vote-up-off\" title=\"This question shows research effort; it is useful and clear\">up vote</a>\n" " <span itemprop=\"upvoteCount\" class=\"vote-count-post \">0</span>\n" " <a class=\"vote-down-off\" title=\"This question does not show any research effort; it is unclear or not useful\">down vote</a>\n\n" " <a class=\"star-off\" href=\"#\" title=\"Click to mark as favorite question (click again to undo)\">favorite</a>\n" " <div class=\"favoritecount\"><b></b></div>\n\n\n" "</div>\n\n" " </td>\n" " \n" "<td class=\"postcell\">\n" "<div>\n" " <div class=\"post-text\" itemprop=\"text\">\n\n" "<p>TYPO3 blocks rendering of pages with more than 13 content-elements when using the Typoscript:</p>\n\n" "<pre class=\"lang-php prettyprint prettyprinted\"><code><span class=\"pln\">brandReplacing </span><span class=\"pun\">{</span><span class=\"pln\">\n" " stdWrap </span><span class=\"pun\">{</span><span class=\"pln\">\n" " replacement </span><span class=\"pun\">{</span><span class=\"pln\">\n" " </span><span class=\"lit\">10</span><span class=\"pln\"> </span><span class=\"pun\">{</span><span class=\"pln\">\n" " search </span><span class=\"pun\">=</span><span class=\"pln\"> </span><span class=\"pun\">®(?=[&lt;]*(?:&lt;[^&gt;]*&gt;[^&lt;]*)*</span><span class=\"pln\">$</span><span class=\"pun\">)</span><span class=\"pln\">\n" " replace </span><span class=\"pun\">=</span><span class=\"pln\"> </span><span class=\"str\">&lt;sup&gt;</span><span class=\"pun\">®&lt;/</span><span class=\"pln\">sup</span><span class=\"pun\">&gt;</span><span class=\"pln\">\n" " useRegExp </span><span class=\"pun\">=</span><span class=\"pln\"> </span><span class=\"lit\">1</span><span class=\"pln\">\n" " </span><span class=\"pun\">}</span><span class=\"pln\">\n" " </span><span class=\"pun\">}</span><span class=\"pln\">\n" " </span><span class=\"pun\">}</span><span class=\"pln\">\n" "</span><span class=\"pun\">}</span></code></pre>\n\n" "<p>as the regex even needs 118 Steps for this short <a href=\"https://regex101.com/r/mA1rL1/1\" rel=\"nofollow\">example</a> (steps needed increases exponentially / like 83000 steps needed for two more attributes). All in all the regex works fine but is too \"huge\".</p>\n\n" "<p>Does anybody have an idea how to reduce the steps (performance) needed to execute the regex and maybe also exclude <code>®</code>-Symbols already wrapped with <code>&lt;sup&gt;</code>-tags? Or is there a better way to solve this problem TYPO3-sided?</p>\n\n" "<p>The regex like above:</p>\n\n" "<pre class=\"lang-php prettyprint prettyprinted\"><code><span class=\"pun\">®(?=[&lt;]*(?:&lt;[^&gt;]*&gt;[^&lt;]*)*</span><span class=\"pln\">$</span><span class=\"pun\">)</span></code></pre>\n\n" "<p>The html code:</p>\n\n" "<pre class=\"lang-php prettyprint prettyprinted\"><code><span class=\"tag\">&lt;img</span><span class=\"pln\"> </span><span class=\"atn\">title</span><span class=\"pun\">=</span><span class=\"atv\">\"Copyright replacement incorrect ®\"</span><span class=\"pln\"> </span><span class=\"atn\">src</span><span class=\"pun\">=</span><span class=\"atv\">\"/fileadmin/filexyz.png\"</span><span class=\"tag\">&gt;</span><span class=\"pln\">\n" "</span><span class=\"tag\">&lt;h1&gt;</span><span class=\"pln\">Copyright replacement correct: ®</span><span class=\"tag\">&lt;/h1&gt;</span><span class=\"pln\">\n" "Also correct replacement here: ®\n" "Maybe NOT here: </span><span class=\"tag\">&lt;sup&gt;</span><span class=\"pln\">®</span><span class=\"tag\">&lt;/sup&gt;</span></code></pre>\n" " </div>\n" " <div class=\"post-taglist\">\n" " <a href=\"/questions/tagged/php\" class=\"post-tag js-gps-track\" title=\"show questions tagged 'php'\" rel=\"tag\">php</a> <a href=\"/questions/tagged/html\" class=\"post-tag js-gps-track\" title=\"show questions tagged 'html'\" rel=\"tag\">html</a> <a href=\"/questions/tagged/regex\" class=\"post-tag js-gps-track\" title=\"show questions tagged 'regex'\" rel=\"tag\">regex</a> <a href=\"/questions/tagged/typo3\" class=\"post-tag js-gps-track\" title=\"show questions tagged 'typo3'\" rel=\"tag\">typo3</a> \n" " </div>\n" " <table class=\"fw\">\n" " <tbody><tr>\n" " <td class=\"vt\">\n" "<div class=\"post-menu\"><a href=\"/q/39486767/5422107\" title=\"short permalink to this question\" class=\"short-link\" id=\"link-post-39486767\">share</a><span class=\"lsep\">|</span><a href=\"/posts/39486767/edit\" class=\"edit-post\" title=\"revise and improve this post\">edit</a><span class=\"lsep\">|</span><a href=\"#\" id=\"delete-post-39486767\" title=\"vote to delete this post\" class=\"\" data-delete-prompt=\"Delete this post?\" data-undelete-prompt=\"Undelete this post?\">delete</a><span class=\"lsep\">|</span><a href=\"#\" class=\"flag-post-link\" title=\"flag this post for serious problems or moderator attention\" data-postid=\"39486767\">flag</a></div> \n" " </td>\n" " <td align=\"right\" class=\"post-signature\">\n" "<div class=\"user-info \">\n" " <div class=\"user-action-time\">\n" " <a href=\"/posts/39486767/revisions\" title=\"show all edits to this post\">edited <span title=\"2016-09-14 09:38:53Z\" class=\"relativetime\">12 mins ago</span></a>\n" " </div>\n" " <div class=\"user-gravatar32\">\n" " \n" " </div>\n" " <div class=\"user-details\">\n" " \n" " <div class=\"-flair\">\n" " \n" " </div>\n" " </div>\n" "</div> </td>\n" " <td class=\"post-signature owner\">\n" " <div class=\"user-info \">\n" " <div class=\"user-action-time\">\n" " asked <span title=\"2016-09-14 09:19:04Z\" class=\"relativetime\">32 mins ago</span>\n" " </div>\n" " <div class=\"user-gravatar32\">\n" " <a href=\"/users/5422107/y-hermes\"><div class=\"gravatar-wrapper-32\"><img src=\"https://i.stack.imgur.com/DobWy.png?s=32&amp;g=1\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" " </div>\n" " <div class=\"user-details\">\n" " <a href=\"/users/5422107/y-hermes\">Y.Hermes</a>\n" " <div class=\"-flair\">\n" " <span class=\"reputation-score\" title=\"reputation score \" dir=\"ltr\">219</span><span title=\"1 silver badge\"><span class=\"badge2\"></span><span class=\"badgecount\">1</span></span><span title=\"17 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">17</span></span>\n" " </div>\n" " </div>\n" "</div>\n" " </td>\n" " </tr>\n" " </tbody></table>\n" "</div>\n" "</td>\n" " </tr>\n" " \n" "<tr>\n" " <td class=\"votecell\"></td>\n" " <td>\n" " <div id=\"comments-39486767\" class=\"comments\">\n" " <table>\n" " <tbody data-remaining-comments-count=\"0\" data-canpost=\"true\" data-cansee=\"false\" data-comments-unavailable=\"false\" data-addlink-disabled=\"false\">\n\n" " <tr id=\"comment-66291719\" class=\"comment \">\n" " <td class=\"comment-actions\">\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " <span title=\"number of 'useful comment' votes received\" class=\"cool\">1</span>\n" " </td>\n" " <td>\n" " <div class=\"comment-up-on\" title=\"you've voted for this as a useful comment\">up voted</div>\n" " </td>\n" " </tr>\n" " <tr>\n" " <td>&nbsp;</td>\n" " <td>\n" " <a class=\"comment-flag\" title=\"Flag this comment for serious problems or moderator attention\">flag</a>\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">Try with a possessive quantifier: <code>®(?=[^&lt;&gt;]*+(?:&lt;[^&gt;]*&gt;[^&lt;]*)*$)</code></span>\n" " –&nbsp;<a href=\"/users/3832970/wiktor-stribi%c5%bcew\" title=\"126,061 reputation\" class=\"comment-user\">Wiktor Stribiżew</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66291719_39486767\"><span title=\"2016-09-14 09:22:11Z\" class=\"relativetime-clean\">28 mins ago</span></a></span>\n" " </div>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66291904\" class=\"comment \">\n" " <td>\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " &nbsp;\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">Wow! Awesome, this was like 75% performance increasing. Do you also have an idea how to exclude already wrapped <code>®</code>-Symbols? Otherwise i will accept that answer ;)</span>\n" " –&nbsp;<a href=\"/users/5422107/y-hermes\" title=\"219 reputation\" class=\"comment-user owner\">Y.Hermes</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66291904_39486767\"><span title=\"2016-09-14 09:27:06Z\" class=\"relativetime-clean\">24 mins ago</span></a></span>\n" " &nbsp;\n" " <a class=\"comment-delete delete-tag\" title=\"delete this comment\">\n" " </a>\n" " <a class=\"comment-delete-empty\" href=\"#\" title=\"delete this comment\"></a> </div>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66292515\" class=\"comment \">\n" " <td class=\"comment-actions\">\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " <a class=\"comment-up comment-up-off\" title=\"this comment adds something useful to the post\">upvote</a>\n" " </td>\n" " </tr>\n" " <tr>\n" " <td>&nbsp;</td>\n" " <td>\n" " <a class=\"comment-flag\" title=\"Flag this comment for serious problems or moderator attention\">flag</a>\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\"><a href=\"http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454\" title=\"regex match open tags except xhtml self contained tags\">stackoverflow.com/questions/1732348/…</a></span>\n" " –&nbsp;<a href=\"/users/752701/jost\" title=\"4,203 reputation\" class=\"comment-user\">Jost</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66292515_39486767\"><span title=\"2016-09-14 09:43:54Z\" class=\"relativetime-clean\">7 mins ago</span></a></span>\n" " </div>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66292597\" class=\"comment \">\n" " <td>\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " &nbsp;\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">As far as I tested that with \"real\" data, the steps just reduced from 275809 to 273256...</span>\n" " –&nbsp;<a href=\"/users/5422107/y-hermes\" title=\"219 reputation\" class=\"comment-user owner\">Y.Hermes</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66292597_39486767\"><span title=\"2016-09-14 09:45:57Z\" class=\"relativetime-clean\">5 mins ago</span></a></span>\n" " &nbsp;\n" " <a class=\"comment-delete delete-tag\" title=\"delete this comment\">\n" " </a>\n" " <a class=\"comment-delete-empty\" href=\"#\" title=\"delete this comment\"></a> </div>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66292711\" class=\"comment \">\n" " <td class=\"comment-actions\">\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " &nbsp;\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">@Jost, I am not parsing the html, this is a TYPO3 function that (i think) just parses each content element's content.</span>\n" " –&nbsp;<a href=\"/users/5422107/y-hermes\" title=\"219 reputation\" class=\"comment-user owner\">Y.Hermes</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66292711_39486767\"><span title=\"2016-09-14 09:49:05Z\" class=\"relativetime-clean\">2 mins ago</span></a></span>\n" " &nbsp;\n" " <a class=\"comment-edit\">edit</a>\n" " &nbsp;\n" " <a class=\"comment-delete delete-tag\" title=\"delete this comment\">\n" " </a>\n" " <a class=\"comment-delete-empty\" href=\"#\" title=\"delete this comment\"></a> </div>\n" " <form id=\"edit-comment-39486767\" class=\"dno\"><div class=\"dno\">@Jost, I am not parsing the html, this is a TYPO3 function that (i think) just parses each content element's content.</div></form>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66292723\" class=\"comment \">\n" " <td class=\"comment-actions\">\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " <a class=\"comment-up comment-up-off\" title=\"this comment adds something useful to the post\">upvote</a>\n" " </td>\n" " </tr>\n" " <tr>\n" " <td>&nbsp;</td>\n" " <td>\n" " <a class=\"comment-flag\" title=\"Flag this comment for serious problems or moderator attention\">flag</a>\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">Provide us a demo with actual input.</span>\n" " –&nbsp;<a href=\"/users/1020526/revo\" title=\"10,131 reputation\" class=\"comment-user\">revo</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66292723_39486767\"><span title=\"2016-09-14 09:49:30Z\" class=\"relativetime-clean\">1 min ago</span></a></span>\n" " </div>\n" " </td>\n" " </tr>\n" " <tr id=\"comment-66292766\" class=\"comment \">\n" " <td class=\"comment-actions\">\n" " <table>\n" " <tbody>\n" " <tr>\n" " <td class=\" comment-score\">\n" " &nbsp;&nbsp;\n" " </td>\n" " <td>\n" " &nbsp;\n" " </td>\n" " </tr>\n" " </tbody>\n" " </table>\n" " </td>\n" " <td class=\"comment-text\">\n" " <div style=\"display: block;\" class=\"comment-body\">\n" " <span class=\"comment-copy\">I would like to but can't because of privacy reasons... But i'm trying to find something similar.</span>\n" " –&nbsp;<a href=\"/users/5422107/y-hermes\" title=\"219 reputation\" class=\"comment-user owner\">Y.Hermes</a>\n" " <span class=\"comment-date\" dir=\"ltr\"><a class=\"comment-link\" href=\"#comment66292766_39486767\"><span title=\"2016-09-14 09:50:31Z\" class=\"relativetime-clean\">37 secs ago</span></a></span>\n" " <span class=\"edited-yes\" title=\"this comment was edited 1 time\"></span>\n" " &nbsp;\n" " <a class=\"comment-edit\">edit</a>\n" " &nbsp;\n" " <a class=\"comment-delete delete-tag\" title=\"delete this comment\">\n" " </a>\n" " <a class=\"comment-delete-empty\" href=\"#\" title=\"delete this comment\"></a> </div>\n" " <form id=\"edit-comment-39486767\" class=\"dno\"><div class=\"dno\">I would like to but can't because of privacy reasons... But i'm trying to find something similar.</div></form>\n" " </td>\n" " </tr>\n" "</tbody>\n" " <tfoot>\n" " <tr>\n" " <td></td>\n" " <td class=\"comment-form\">\n" " <form id=\"add-comment-39486767\" class=\"\" data-placeholdertext=\"Use comments to reply to other users or notify them of changes. If you are adding new information, edit your post instead of commenting.\" style=\"display: none;\"><table><tbody><tr><td><textarea name=\"comment\" cols=\"68\" rows=\"3\" placeholder=\"Use comments to reply to other users or notify them of changes. 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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html