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

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"<[^>]+>").unwrap(); let string = " <!DOCTYPE html> <html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\"> <head> <title>Online regex tester and debugger: JavaScript, Python, PHP, and PCRE</title> <link href=\"//fonts.googleapis.com/css?family=Open+Sans:400,700,300&amp;subset=latin\" rel=\"stylesheet\" type=\"text/css\"> <link href=\"/css/main.1433274325.css\" rel=\"stylesheet\" type=\"text/css\"> <link type=\"text/plain\" rel=\"author\" href=\"//regex101.com/humans.txt\"> <link rel=\"icon\" href=\"/favicon.ico\" type=\"image/x-icon\"> <link href=\"//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css\" rel=\"stylesheet\"> <meta charset=\"utf-8\"> <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\"> <meta name=\"keywords\" content=\"javascript,regex,regular expression,debugger,explainer,helper,tester,match,pcre,python,editor\"> <meta name=\"description\" content=\"Online regex tester, debugger with highlighting for PHP, PCRE, Python and JavaScript.\"> <meta name=\"author\" content=\"Firas Dib\"> <meta property=\"twitter:card\" content=\"summary\"> <meta property=\"twitter:site\" content=\"@regex101\"> <meta property=\"twitter:title\" content=\"Regex101 - online regex editor and debugger\"> <meta property=\"twitter:description\" content=\"Regex101 allows you to create, debug, test and have your expressions explained for PHP, PCRE, JavaScript and Python. The website also features a community where you can share useful expressions.\"> <meta property=\"twitter:creator\" content=\"@regex101\"> <meta property=\"twitter:image\" content=\"//regex101.com/gfx/preview.png\"> <meta property=\"twitter:domain\" content=\"regex101.com\"> </head> <body class=\"box_overflow_fix light default\" spellcheck=\"false\"> <div id=\"header_parent\"> <div id=\"header\"> <div id=\"header_menu\"> <a target=\"_blank\" href=\"https://twitter.com/regex101\"><i class=\"fa fa-twitter-square \"></i><span class=\"large_menu\">RegEx101</span></a> <a target=\"_blank\" href=\"https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=firas%2edib%40gmail%2ecom&amp;lc=US&amp;item_name=Regex101&amp;no_note=0&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donate_SM%2egif%3aNonHostedGuest\"><i class=\"fa fa-dollar\"></i><span class=\"large_menu\">Donate</span></a> <a target=\"_blank\" href=\"mailto:contact@regex101.com\"><i class=\"fa fa-send\"></i><span class=\"large_menu\">Contact</span></a> <a target=\"_blank\" href=\"https://github.com/firasdib/Regex101/issues\"><i class=\"fa fa-exclamation-triangle\"></i><span class=\"large_menu\">Bug reports &amp; Suggestions</span></a> <div id=\"settings_popup\"> <span class=\"fa-stack fa-lg\" id=\"settings\" title=\"Adjust settings and theme\"> <i class=\"fa fa-circle fa-stack-2x\"></i> <i class=\"fa fa-wrench fa-stack-1x\"></i> </span> <span class=\"fa-stack fa-lg\" id=\"sign_in_out\" title=\"Sign in\"> <i class=\"fa fa-circle fa-stack-2x\"></i> <i class=\"fa fa-sign-in fa-stack-1x\"></i> </span> </div> </div> <div class=\"text_overflow\"> <h1 id=\"logo\"> <a href=\"/\"> <div id=\"large_header\"><span class=\"part1\">regular</span> <span class=\"part2\">expressions</span> <span class=\"part3\">101</span></div> <div id=\"small_header\"><span class=\"part1\">reg</span><span class=\"part2\">ex</span> <span class=\"part3\">101</span></div> </a> </h1> <ul id=\"header_nav\"> <li class=\"fullscreen header_nav active main_menu main\" data-id=\"40\"> <i class=\"fa fa-terminal\"></i><span class=\"large_menu\">Regex Tester</span> </li> <li class=\"fullscreen header_nav main_menu community\" data-id=\"43\"> <i class=\"fa fa-cloud\"></i><span class=\"large_menu\">Regex Library</span> </li> <li class=\"fullscreen header_nav main_menu\" data-id=\"42\"> <a target=\"_blank\" href=\"http://webchat.freenode.net/?nick=regex101-....&amp;channels=regex\" id=\"irc\"> <i class=\"fa fa-comments\"></i><span class=\"large_menu\">IRC</span> </a> </li> </ul> </div> </div> </div> <div id=\"settings_popup_contents\"> <div class=\"left\"> <div class=\"label\"><i class=\"fa fa-gear settings\"></i> General Settings</div> <input type=\"checkbox\" id=\"display_whitespace\" name=\"display_whitespace\" tabindex=\"999\" value=\"1\" data-id=\"1\"> <label class=\"design_label\" for=\"display_whitespace\"> <span></span>Display Whitespace </label> <input type=\"checkbox\" id=\"small_menu\" name=\"small_menu\" tabindex=\"999\" value=\"1\" data-id=\"201\"> <label class=\"design_label\" for=\"small_menu\"> <span></span>Use minimal view </label> <div class=\"label\"><i class=\"fa fa-picture-o theme\"></i> Theme</div> <input type=\"radio\" id=\"light_theme\" name=\"theme\" tabindex=\"999\" value=\"1\" data-id=\"203\" checked=\"checked\"> <label class=\"design_label\" for=\"light_theme\"> <span></span>Use light theme </label> <input type=\"radio\" id=\"dark_theme\" name=\"theme\" tabindex=\"999\" value=\"1\" data-id=\"200\"> <label class=\"design_label\" for=\"dark_theme\"> <span></span>Use dark theme </label> </div> <div class=\"right\"> <div id=\"colorizer_themes\"> <div class=\"label\"><i class=\"fa fa-terminal regex\"></i> Regex Settings</div> <input type=\"checkbox\" id=\"colorize_regex\" name=\"colorize_regex\" tabindex=\"999\" value=\"1\" data-id=\"9\"> <label class=\"design_label\" for=\"colorize_regex\"> <span></span>Colorize syntax </label> <div class=\"select_themes\"> <strong>Theme:</strong> <select class=\"light_themes\" data-id=\"999\"> <option value=\"default\">Default</option> <option value=\"default_light\">Default - Light</option> </select><select class=\"dark_themes\" data-id=\"999\"> <option value=\"default\">Default</option> </select> </div> <input type=\"checkbox\" id=\"smart_completion\" name=\"smart_completion\" tabindex=\"999\" value=\"1\" data-id=\"210\"> <label class=\"design_label\" for=\"smart_completion\"> <span></span>Enable smart auto-completion </label> <input type=\"checkbox\" id=\"wrap_newlines\" name=\"wrap_newlines\" tabindex=\"999\" value=\"1\" data-id=\"10\"> <label class=\"design_label\" for=\"wrap_newlines\"> <span></span>Wrap long lines </label> <input type=\"checkbox\" id=\"highlight_interaction\" name=\"highlight_interaction\" tabindex=\"999\" value=\"0\" data-id=\"220\"> <label class=\"design_label\" for=\"highlight_interaction\"> <span></span>Highlight groups </label> <input type=\"checkbox\" id=\"display_nonpart\" name=\"display_nonpart\" tabindex=\"999\" value=\"0\" data-id=\"221\"> <label class=\"design_label\" for=\"display_nonpart\"> <span></span>Show non-participating groups </label> <div class=\"execution_limit\"> <label class=\"design_label\" for=\"execution_limit\">Max execution time:</label> <input type=\"text\" name=\"execution_limit\" id=\"execution_limit\" placeholder=\"2000\"><em>ms</em> </div> </div> <!--li id=\"dark_theme\" data-id=\"200\" class=\"menu_item\"> <i class=\"fa fa-picture-o\"></i><span class=\"large_menu\">Use dark theme</span> </li--> </div> <div class=\"arrow-box-tip reverse\"></div> </div> <div class=\"denial_of_service\" id=\"splash\"> <div> Initializing editor, please stand by... <i class=\"fa fa-cog fa-spin\"></i> </div> </div> <div class=\"denial_of_service\" id=\"loading_screen\"> <div> Loading content, please hold... <i class=\"fa fa-cog fa-spin\"></i> </div> </div> <noscript> <div class=\"denial_of_service\"> <div> It seems like you have JavaScript disabled, rendering this website virtually useless. Please enable JavaScript to use this service. If you don't know how, try <a href=\"http://enable-javascript.com/\">this</a>. </div> </div> </noscript> <div class=\"denial_of_service\" id=\"old_browser\"> <div>You seem to be using an outdated version of your browser which is no longer supported by <strong>regex101.com</strong>. It is highly recommended that you upgrade your browser. Sorry for the inconvenience.</div> </div> <div id=\"inline_menu\" class=\"box_overflow_fix general_menu\"> <ul class=\"first-ul overflow_handler\"> <li class=\"regex_menu extension_menu share_menu\"> <ul> <li class=\"menu_notice\">Save &amp; Share</li> <li id=\"permalink_menu\" class=\"menu_item disabled\" data-id=\"3\" data-permalink=\"\" data-version=\"\"> <i class=\"fa fa-save\"></i><span class=\"large_menu\">Save Regex (CTRL+S)</span> </li> <li id=\"permalink_fork\" class=\"menu_item\" data-id=\"900\" style=\"display: none;\"> <i class=\"fa fa-code-fork\"></i><span class=\"large_menu\">Fork Regex</span> </li> <li class=\"menu_item unique disabled\" data-id=\"4\" id=\"community_submit\"> <i class=\"fa fa-cloud-upload\"></i><span class=\"large_menu\">Add to Regex Library</span> </li> </ul> </li> <li class=\"regex_menu extension_menu no_top_space\"> <ul> <li class=\"menu_notice\">Flavor</li> <li class=\"flavor_pcre menu_item active\" data-id=\"20\"> <span 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<label class=\"design_label\" for=\"internal_opt\"> <span></span>Disable internal engine optimizations </label> <a href=\"#\" id=\"debugger_collapse\">collapse all</a> </div> </div> <div id=\"regex_debugger_window\" class=\"overflow_handler\"> <div class=\"debugger_loader_padding\"></div> </div> </div> <div id=\"main_editor\" class=\"flex-container box_overflow_fix\"> <div id=\"regex_container\" class=\"flex-regex box_overflow_fix\"> <label for=\"regex\"> Regular Expression <div id=\"version_container\" style=\"display: none;\"> &mdash; <select id=\"version_selector\"> </select> </div> <span id=\"result_indicator\" class=\"no_match\">no match</span> </label> <div id=\"regex_input\" class=\"box_overflow_fix richtext_parent\"> <div id=\"delimiter_selector\" class=\"richtext_left slash_menu slash box_overflow_fix\" data-dropdown=\".delimiter-dropdown\">/</div> <div class=\"richtext_right\"> <div class=\"slash slash_menu\" data-dropdown=\".delimiter-dropdown\">/</div><!-- --><div id=\"options_container\"> <input data-focus=\"#options_container\" value=\"\" id=\"options\" name=\"options\" size=\"20\" tabindex=\"2\" type=\"text\" placeholder=\"gmixXsuUAJ\"/> <i id=\"options_helper\" class=\"fa fa-question-circle\"></i> </div> <div id=\"options_helper_contents\"></div> </div> <div class=\"richtext_padding\"> <div class=\"richtext_container\" id=\"richtext_regex_container\"> <div class=\"richtext\" id=\"richtext_regex\"> <pre><span class=\"colorizer_height\"></span><br/></pre> <pre id=\"regex_colors\"><span></span><br/></pre> <textarea data-focus=\"#richtext_regex_container\" spellcheck=\"false\" id=\"regex\" name=\"regex\" tabindex=\"1\" rows=\"1\" cols=\"50\" placeholder=\"insert your regular expression here\" autofocus=\"autofocus\"></textarea> </div> </div> </div> </div> </div> <div id=\"test_result_container\" class=\"box_overflow_fix flex-text \"> <label for=\"regex_string\">Test string</label> <div class=\"overflow_handler flex-grow\"> <div class=\"richtext\" id=\"richtext_test\"> <pre><span id=\"richtext_test_size\"></span><br>&nbsp;</pre> <pre id=\"richtext_test_colors\"><span id=\"test_color_element\"></span><br></pre> <textarea wrap=\"off\" data-focus=\"#test_result_container .overflow_handler\" spellcheck=\"false\" id=\"regex_string\" class=\"box_overflow_fix\" name=\"test\" rows=\"10\" tabindex=\"3\" placeholder=\"insert your test string here\"></textarea> </div> </div> </div> <div id=\"subst_parent\" class=\"box_overflow_fix flex-sub \"> <label for=\"sub\" class=\"expander collapsed\"> <span class=\"fa fa-plus-circle\"></span>Substitution </label> <div id=\"subst_container\" class=\"overflow_handler flex-grow\"> <input class=\"box_overflow_fix\" value=\"\" id=\"sub\" name=\"sub\" tabindex=\"3\" type=\"text\" placeholder=\"substitution; \\num = backreference, \\n = newline, \\t = tab\"> <div id=\"subst_area\" class=\"overflow_handler flex-grow\"> <div contenteditable=\"true\" id=\"subst_result\" class=\"monospace hard_break box_overflow_fix\"></div> </div> </div> </div> <div id=\"unit_tests_builder\" class=\"box_overflow_fix flex-unit-builder\"> <div class=\"label\">Create test<div class=\"right\"><a href=\"#\" class=\"button\" tabindex=\"23\">Add test</a></div></div> <div id=\"unit_test_creator\" class=\"box_overflow_fix\"> <div class=\"test_builder\"> <div class=\"the_test pt1\"> <div class=\"left\">given the string</div> <div class=\"right\"><textarea tabindex=\"19\" class=\"box_overflow_fix\" id=\"unit_data\" placeholder=\"test string\"></textarea></div> </div> <div class=\"the_test pt2\"> <div class=\"left\"><span>assert that</span><select id=\"unit_type\" tabindex=\"20\"></select><select tabindex=\"21\" id=\"assert_type\"></select></div> <div class=\"right\"><textarea tabindex=\"22\" class=\"box_overflow_fix\" id=\"assert_equals\" type=\"text\" placeholder=\"string value\"></textarea></div> </div> </div> </div> </div> <div id=\"unit_tests_list\" class=\"box_overflow_fix flex-unit-list\"> <div class=\"label\">Test list<div class=\"right unit_test_player\"><i class=\"fa fa-play run_tests\" title=\"Run tests (CTRL+K)\"></i><span class=\"unit_result\">n/a</span></div></div> <div id=\"unit_test_window\" class=\"unit_test_window flex-grow overflow_handler\"> <div class=\"all_tests\"> <div id=\"unit_test_container\"> </div> </div> </div> </div> </div> <div id=\"regex_treeview\" class=\"box_overflow_fix\"> <div id=\"treeview_resizer\" title=\"Keep dragging\"><div></div></div> <div id=\"treeview_content\" class=\"box_overflow_fix flex-container\"> <div id=\"scroll_treeview\" class=\"box_overflow_fix flex-elem\"> <div id=\"explainer_label\" class=\"label expander\"> <span class=\"fa\"></span>Explanation </div> <div class=\"overflow_handler box_overflow_fix flex-grow\"> <div id=\"treeview\" style=\"height: 100%\"> An explanation of your regex will be automatically generated as you type. </div> </div> </div> <div id=\"scroll_match\" class=\"box_overflow_fix flex-elem\"> <div id=\"match_label\" class=\"label expander\"> <span class=\"fa\"></span>Match information </div> <div class=\"overflow_handler box_overflow_fix flex-grow\"> <div id=\"match_info\"> Detailed match information will be displayed here automatically. </div> </div> </div> <div id=\"quickref\" class=\"box_overflow_fix flex-elem\"> <div class=\"label expander\"> <span class=\"fa\"></span>Quick reference </div> <div id=\"quickref_data\" class=\"flex-grow\"> <div id=\"first_menu\" class=\"box_overflow_fix general_menu\"> <ul> <li class=\"menu_notice\"> <div class=\"filter_input filter_mini box_overflow_fix\" id=\"quickref_filter_parent\"> <i class=\"fa fa-search\"></i> <div class=\"filter_div\"> <input data-focus=\"#quickref_filter_parent\" type=\"text\" id=\"quickref_filter\" class=\"filter_parent box_overflow_fix\" name=\"quickref_filter\" value=\"\" placeholder=\"filter\"> </div> </div> <span class=\"text_overflow\" style=\"margin-right: 5px;\">Full reference</span> </li> <li class=\"menu_item\" data-id=\"basic\"><i class=\"fa fa-star\"></i>Most used tokens</li> <li class=\"menu_item\" data-id=\"fullref\"><i class=\"fa fa-database\"></i>All tokens</li> <li class=\"menu_notice\">Categories</li> <li class=\"menu_item\" data-id=\"other\"><i class=\"fa fa-dot-circle-o\"></i>General tokens</li> <li class=\"menu_item\" data-id=\"anchors\"><i class=\"fa fa-anchor\"></i>Anchors</li> <li class=\"menu_item\" data-id=\"meta\"><i class=\"fa fa-bolt\"></i>Meta sequences</li> <li class=\"menu_item\" data-id=\"quantifiers\"><i class=\"fa fa-asterisk\"></i>Quantifiers</li> <li class=\"menu_item\" data-id=\"groups\"><i class=\"fa fa-dot-circle-o\"></i>Group constructs</li> <li class=\"menu_item\" data-id=\"charclass\"><i class=\"fa fa-th-large\"></i>Character classes</li> <li class=\"menu_item\" data-id=\"modifiers\"><i class=\"fa fa-flag\"></i>Flags/Modifiers</li> <li class=\"menu_item\" data-id=\"subst\"><i class=\"fa fa-scissors\"></i>Substitution</li> <li class=\"menu_item\" id=\"quickref_search\"><i class=\"fa fa-search\"></i>Search result</li> </ul> </div> <div id=\"second_menu\" class=\"no_icon box_overflow_fix general_menu overflow_handler\"> <ul class=\"no_icon\"></ul> </div> </div> </div> </div> </div> </div> </div> <div class=\"delimiter-dropdown dropdown dropdown-relative dropdown-tip dropdown-index\"> <ul class=\"dropdown-menu\"> <li><a href=\"#\">/</a></li> <li><a href=\"#\">~</a></li> <li><a href=\"#\">@</a></li> <li><a href=\"#\">;</a></li> <li><a href=\"#\">&#37;</a></li> <li><a href=\"#\">`</a></li> </ul> </div> <div id=\"dimmer\"></div> <div id=\"dimmer-popup\"></div> <div id=\"match-tooltip\" class=\"arrow-box monospace\"> <div id=\"tooltip-contents\"></div> <div id=\"match-tooltip-tip\" class=\"arrow-box-tip\"></div> </div> <script src=\"/js/underscore-min.1433274318.js\" type=\"text/javascript\"></script> <script src=\"//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js\" type=\"text/javascript\"></script> <script src=\"/js/jquery.tools.1433274318.js\" type=\"text/javascript\"></script> <script src=\"/js/general.regex101.1433274319.js\" type=\"text/javascript\"></script> <script src=\"/js/colorParser.regex101.1433274323.js\" type=\"text/javascript\"></script> <script src=\"/js/explainer.regex101.1433274320.js\" type=\"text/javascript\"></script> <script>(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','//www.google-analytics.com/analytics.js','ga');ga('create','UA-33878479-1','regex101.com');ga('send','pageview');</script> <script src=\"/js/common.regex101.1433274322.js\" type=\"text/javascript\"></script> <script src=\"/js/matcher.regex101.1433274321.js\" type=\"text/javascript\"></script> </body> </html>"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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 Rust, please visit: https://docs.rs/regex/latest/regex/