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

/
/
gm

Test String

Code Generator

Language

Generated Code

$re = '/<a[^>]+href\s?=\s?"([^"]+)"[^>]?>/m'; $str = ' <!DOCTYPE html> <html itemscope itemtype="http://schema.org/QAPage" class="html__responsive"> <head> <title>.net - C# - How to get data from mywebsearch(Search Engine) - Stack Overflow</title> <link rel="shortcut icon" href="https://cdn.sstatic.net/Sites/stackoverflow/img/favicon.ico?v=4f32ecc8f43d"> <link rel="apple-touch-icon image_src" href="https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon.png?v=c78bd457575a"> <link rel="search" type="application/opensearchdescription+xml" title="Stack Overflow" href="/opensearch.xml"> <meta name="referrer" content="origin" /> <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, minimum-scale=1.0"> <meta property="og:type" content= "website" /> <meta property="og:url" content="https://stackoverflow.com/questions/52339951/c-sharp-how-to-get-data-from-mywebsearchsearch-engine"/> <meta property="og:site_name" content="Stack Overflow" /> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon@2.png?v=73d79a89bded" /> <meta name="twitter:card" content="summary"/> <meta name="twitter:domain" content="stackoverflow.com"/> <meta name="twitter:title" property="og:title" itemprop="title name" content="C# - How to get data from mywebsearch(Search Engine)" /> <meta name="twitter:description" property="og:description" itemprop="description" content="I have been trying to make a tool that I enter keyword and it will automatically do this: int.search.mywebsearch.com/mywebsearch/GGweb.jhtml?searchfor=Keyword then ---&amp;gt; Scrape all the urls in the " /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <script src="https://cdn.sstatic.net/Js/stub.en.js?v=25ae1d4bcf1b"></script> <link rel="stylesheet" type="text/css" href="https://cdn.sstatic.net/Shared/stacks.css?v=a35f1fd52a5c"> <link rel="stylesheet" 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</li> </ol> </nav> </div> </div> <div id="content" class="snippet-hidden"> <div itemscope itemtype="http://schema.org/Question"> <link itemprop="image" href="https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon.png?v=c78bd457575a"> <div class="inner-content clearfix"> <div id="question-header" class="grid"> <h1 itemprop="name" class="grid--cell fs-headline1 fl1"><a href="/questions/52339951/c-sharp-how-to-get-data-from-mywebsearchsearch-engine" class="question-hyperlink">C# - How to get data from mywebsearch(Search Engine)</a></h1> <div class="pl8 aside-cta grid--cell" role="navigation" aria-label="ask new question"> <a href="/questions/ask" class="d-inline-flex ai-center ws-nowrap s-btn s-btn__primary" >Ask Question</a> </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question" data-questionid="52339951" id="question"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="vote"> <input type="hidden" name="_id_" value="52339951"> <a class="vote-up-off" title="This question shows research effort; it is useful and clear (click again to undo)">up vote</a> <span itemprop="upvoteCount" class="vote-count-post ">1</span> <a class="vote-down-off" title="This question does not show any research effort; it is unclear or not useful (click again to undo)">down vote</a> <a class="star-off" href="#">favorite</a> <div class="favoritecount"><b></b></div> </div> </div> <div class="postcell post-layout--right"> <div class="post-text" itemprop="text"> <p>I have been trying to make a tool that I enter keyword and it will automatically do this:</p> <pre><code>int.search.mywebsearch.com/mywebsearch/GGweb.jhtml?searchfor=Keyword then ---&gt; Scrape all the urls in the page </code></pre> <p>however, when I go to regexxr or regex101, it seems like the urls not there and I can\'t use regular expression to get it. How can I scrape something that using WebClient.downloadstring(url) can\'t download</p> <p>Code:</p> <pre><code>WebClient wc = new WebClient(); foreach(string s in Keywords) { string url = wc.DownloadString("https://int.search.mywebsearch.com/mywebsearch/GGmain.jhtml?&amp;searchfor=" + s); MatchCollection mc = Regex.Matches(url, @""); // Didn\'t write any regex yet } </code></pre> </div> <div class="post-taglist grid gs4 gsy fd-column"> <div class="grid ps-relative"> <a href="/questions/tagged/c%23" class="post-tag" title="show questions tagged &#39;c#&#39;" rel="tag">c#</a> <a href="/questions/tagged/.net" class="post-tag" title="show questions tagged &#39;.net&#39;" rel="tag">.net</a> <a href="/questions/tagged/web" class="post-tag" title="show questions tagged &#39;web&#39;" rel="tag">web</a> </div> </div> <div class="mb0 "> <div class="mt16 pt4 grid gs8 gsy fw-wrap jc-end ai-start"> <div class="grid--cell mr16" style="flex: 1 1 100px;"> <div class="post-menu"><a href="/q/52339951/1079221" title="short permalink to this question" class="short-link" id="link-post-52339951">share</a><span class="lsep">|</span><a href="/posts/52339951/edit" class="edit-post" title="revise and improve this post">edit</a><span class="lsep">|</span><a href="#" class="close-question-link" title="vote to close this question (when closed, no new answers can be added)" data-questionid="52339951" data-isclosed="false">close</a><span class="lsep">|</span><a href="#" class="flag-post-link" title="flag this post for serious problems or moderator attention" data-postid="52339951">flag</a></div> <script> StackExchange.using("inlineTagEditing", function () { StackExchange.inlineTagEditing.init({ editTagsText: "Edit tags" }); }); </script> </div> <div class="post-signature owner grid--cell"> <div class="user-info "> <div class="user-action-time"> asked <span title="2018-09-14 22:33:06Z" class="relativetime">50 mins ago</span> </div> <div class="user-gravatar32"> <a href="/users/10365452/ariel"><div class="gravatar-wrapper-32"><img src="https://www.gravatar.com/avatar/19b8a4d0ac9a49b27f8799e094ea6691?s=32&amp;d=identicon&amp;r=PG&amp;f=1" alt="" width="32" height="32"></div></a> </div> <div class="user-details"> <a href="/users/10365452/ariel">Ariel</a> <div class="-flair"> <span class="reputation-score" title="reputation score " dir="ltr">8</span><span title="3 bronze badges"><span class="badge3"></span><span class="badgecount">3</span></span> </div> </div> </div> <div class="js-new-contributor-indicator ps-relative"> <div class="new-contributor-indicator fc-medium py6 px8 bbr-sm"> <span class="js-new-contributor-label"><svg aria-hidden="true" class="svg-icon iconWave" width="18" height="18" viewBox="0 0 18 18"><path d="M10.7 17c-2.3 0-3.9-2.05-5.07-3.54l-.49-.6c-.67-.8-1.59-1.63-2.4-2.36A10.91 10.91 0 0 1 1.1 8.87a.79.79 0 0 1-.09-.56c.04-.19.14-.34.27-.4.14-.07.29-.1.45-.1.35 0 .67.18.87.34l3.5 2.75c.04.03.1.03.13 0a.09.09 0 0 0 .02-.13l-.02-.02c-.57-.8-3.42-4.77-3.71-5.15-.21-.27-.3-.58-.24-.84.05-.2.2-.37.4-.48.18-.09.35-.13.52-.13.44 0 .76.28.96.51l3.6 4.42c.04.04.07.06.14.02.05-.02.06-.07.03-.12L4.41 2.96a.94.94 0 0 1-.1-.73.92.92 0 0 1 .47-.57 1.06 1.06 0 0 1 1.4.39l3.8 6.14c.03.04.07.07.14.04.04-.03.06-.07.04-.13A153.8 153.8 0 0 0 8.1 2.54c-.31-.68-.2-1.14.36-1.42.52-.27 1.14-.07 1.47.48l3.69 8.3c.01.04.05.05.1.06a.1.1 0 0 0 .09-.07l.66-2.28c.1-.3.31-.56.62-.72.3-.15.65-.18.98-.1.69.2 1.09.87.89 1.52-.1.37-.46 1.73-.99 3.43l-.1.33c-.58 1.86-1.03 3.33-3.11 4.4-.7.35-1.38.53-2.05.53zm-5.84-.17c-.2.2-1.22 0-1.96-.74s-.92-1.75-.73-1.94c.2-.2.62.61 1.36 1.35.74.75 1.52 1.14 1.33 1.33zm8.39-14.61c.2-.2 1.2 0 1.95.74.74.74.92 1.75.73 1.94-.2.2-.62-.61-1.36-1.35-.74-.75-1.52-1.14-1.32-1.33z"/></svg> New contributor</span> </div> <div class="js-new-contributor-popover temp-popover temp-popover__bottom"> <div class="temp-popover--arrow"></div> <div class="p12 fs-caption"> <a href="/users/10365452/ariel">Ariel</a> is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our <a href="/conduct">Code of Conduct</a>. </div> </div> </div> </div> </div> </div> </div> <div class="post-layout--right"> <div id="comments-52339951" class="comments js-comments-container "> <ul class="comments-list js-comments-list" data-remaining-comments-count="0" data-canpost="true" data-cansee="false" data-comments-unavailable="false" data-addlink-disabled="false"> <li id="comment-91627438" class="comment js-comment " data-comment-id="91627438"> <div class="js-comment-actions comment-actions"> <div class="comment-score"> </div> <div class="comment-voting mtn2"> <a tabindex="0" role="button" href="#" class="comment-up comment-up-off" aria-label="Upvote Comment" title="This comment adds something useful to the post"> <svg aria-hidden="true" class="svg-icon iconArrowUp" width="18" height="18" viewBox="0 0 18 18"><path d="M1 13h16L9 5z"/></svg> </a> </div> <div class="comment-flagging"> <a tabindex="0" role="button" href="#" class="comment-flag" aria-label="Flag Comment" title="Flag this comment for serious problems or moderator attention"> <svg aria-hidden="true" class="svg-icon iconFlag" width="18" height="18" viewBox="0 0 18 18"><path d="M3 2v14h2v-6h3.6l.4 1h6V3H9.5L9 2z"/></svg> </a> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body" style="display: block;" > <span class="comment-copy">Are you saying you can&#39;t figure out a regular expression for getting URLs from HTML?</span> &ndash;&nbsp;<a href="/users/119549/jacob" title="55,220 reputation" class="comment-user">Jacob</a> <span class="comment-date" dir="ltr"><span title="2018-09-14 23:05:14Z" class="relativetime-clean">17 mins ago</span></span> </div> </div> </li> <li id="comment-91627468" class="comment js-comment " data-comment-id="91627468"> <div class="js-comment-actions comment-actions"> <div class="comment-score"> </div> <div class="comment-voting mtn2"> <a tabindex="0" role="button" href="#" class="comment-up comment-up-off" aria-label="Upvote Comment" title="This comment adds something useful to the post"> <svg aria-hidden="true" class="svg-icon iconArrowUp" width="18" height="18" viewBox="0 0 18 18"><path d="M1 13h16L9 5z"/></svg> </a> </div> <div class="comment-flagging"> <a tabindex="0" role="button" href="#" class="comment-flag" aria-label="Flag Comment" title="Flag this comment for serious problems or moderator attention"> <svg aria-hidden="true" class="svg-icon iconFlag" width="18" height="18" viewBox="0 0 18 18"><path d="M3 2v14h2v-6h3.6l.4 1h6V3H9.5L9 2z"/></svg> </a> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body" style="display: block;" > <span class="comment-copy">I can, for other search engine everything works fine, I don&#39;t know why it doesn&#39;t work for this engine</span> &ndash;&nbsp;<a href="/users/10365452/ariel" title="8 reputation" class="comment-user owner">Ariel</a> <span class="comment-date" dir="ltr"><span title="2018-09-14 23:07:18Z" class="relativetime-clean">15 mins ago</span></span> </div> </div> </li> <li id="comment-91627511" class="comment js-comment " data-comment-id="91627511"> <div class="js-comment-actions comment-actions"> <div class="comment-score"> </div> <div class="comment-voting mtn2"> <a tabindex="0" role="button" href="#" class="comment-up comment-up-off" aria-label="Upvote Comment" title="This comment adds something useful to the post"> <svg aria-hidden="true" class="svg-icon iconArrowUp" width="18" height="18" viewBox="0 0 18 18"><path d="M1 13h16L9 5z"/></svg> </a> </div> <div class="comment-flagging"> <a tabindex="0" role="button" href="#" class="comment-flag" aria-label="Flag Comment" title="Flag this comment for serious problems or moderator attention"> <svg aria-hidden="true" class="svg-icon iconFlag" width="18" height="18" viewBox="0 0 18 18"><path d="M3 2v14h2v-6h3.6l.4 1h6V3H9.5L9 2z"/></svg> </a> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body" style="display: block;" > <span class="comment-copy">It&#39;s not clear to me what you&#39;re saying is not working. Your question shows you downloading search results. Are you saying that the download isn&#39;t working or that you are downloading and you can&#39;t find URLs? And if these aren&#39;t working, what&#39;s the expected vs actual behavior?</span> &ndash;&nbsp;<a href="/users/119549/jacob" title="55,220 reputation" class="comment-user">Jacob</a> <span class="comment-date" dir="ltr"><span title="2018-09-14 23:10:44Z" class="relativetime-clean">12 mins ago</span></span> <span title="this comment was edited 1 time"> <svg aria-hidden="true" class="svg-icon va-text-bottom o50 iconPencilSm" width="14" height="15" viewBox="0 0 14 15"><path d="M8.37 4.7L2 11.11V13h1.88l6.37-6.43zM12.23 3.83L11.1 2.71a.5.5 0 0 0-.7 0L9.2 3.86l1.88 1.84 1.14-1.16a.5.5 0 0 0 0-.71z"/></svg> </span> </div> </div> </li> </ul> <div class="comment-form"> <div class="js-add-comment-message d-none"> <svg aria-hidden="true" class="svg-icon iconWave" width="18" height="18" viewBox="0 0 18 18"><path d="M10.7 17c-2.3 0-3.9-2.05-5.07-3.54l-.49-.6c-.67-.8-1.59-1.63-2.4-2.36A10.91 10.91 0 0 1 1.1 8.87a.79.79 0 0 1-.09-.56c.04-.19.14-.34.27-.4.14-.07.29-.1.45-.1.35 0 .67.18.87.34l3.5 2.75c.04.03.1.03.13 0a.09.09 0 0 0 .02-.13l-.02-.02c-.57-.8-3.42-4.77-3.71-5.15-.21-.27-.3-.58-.24-.84.05-.2.2-.37.4-.48.18-.09.35-.13.52-.13.44 0 .76.28.96.51l3.6 4.42c.04.04.07.06.14.02.05-.02.06-.07.03-.12L4.41 2.96a.94.94 0 0 1-.1-.73.92.92 0 0 1 .47-.57 1.06 1.06 0 0 1 1.4.39l3.8 6.14c.03.04.07.07.14.04.04-.03.06-.07.04-.13A153.8 153.8 0 0 0 8.1 2.54c-.31-.68-.2-1.14.36-1.42.52-.27 1.14-.07 1.47.48l3.69 8.3c.01.04.05.05.1.06a.1.1 0 0 0 .09-.07l.66-2.28c.1-.3.31-.56.62-.72.3-.15.65-.18.98-.1.69.2 1.09.87.89 1.52-.1.37-.46 1.73-.99 3.43l-.1.33c-.58 1.86-1.03 3.33-3.11 4.4-.7.35-1.38.53-2.05.53zm-5.84-.17c-.2.2-1.22 0-1.96-.74s-.92-1.75-.73-1.94c.2-.2.62.61 1.36 1.35.74.75 1.52 1.14 1.33 1.33zm8.39-14.61c.2-.2 1.2 0 1.95.74.74.74.92 1.75.73 1.94-.2.2-.62-.61-1.36-1.35-.74-.75-1.52-1.14-1.32-1.33z"/></svg> <a href="/users/10365452/ariel">Ariel</a> is a new contributor. 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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 PHP, please visit: http://php.net/manual/en/ref.pcre.php