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

/
/
mg

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"(?m)(?<=var config = )(.*?)(?=; if \(!config.request\) {)").unwrap(); let string = "<!DOCTYPE html> <html lang=\"en\"> <head> <meta charset=\"utf-8\"> <meta name=\"viewport\" content=\"width=device-width,initial-scale=1,user-scalable=yes\"> <meta name=\"robots\" content=\"noindex\"> <title>Institutional Trading - Cross Pair Manipulation Example(2) from FX on Vimeo</title> <style> body, html, .player, .fallback { overflow: hidden; width: 100%; height: 100%; margin: 0; padding: 0; background-color: transparent; } .player.loading { opacity: 0; } </style> <script> !function(){if('PerformanceLongTaskTiming' in window){var g=window.__tti={e:[]}; g.o=new PerformanceObserver(function(l){g.e=g.e.concat(l.getEntries())}); g.o.observe({entryTypes:['longtask']})}}(); </script> <!--[if IE]><script>var cacheBuster = '?' + Math.round((Math.random() * 1000) + new Date().getTime());</script><![endif]--> </head> <body> <div class=\"vp-placeholder\"> <style> .vp-placeholder, .vp-placeholder-thumb, .vp-placeholder-thumb::before, .vp-placeholder-thumb::after { position: absolute; top: 0; bottom: 0; left: 0; right: 0; } .vp-placeholder { visibility: hidden; width: 100%; max-height: 100%; height: calc(720 / 1278 * 100vw); max-width: calc(1278 / 720 * 100vh); margin: auto; } .vp-placeholder-carousel { display: none; background-color: #000; position: absolute; left: 0; right: 0; bottom: -60px; height: 60px; } </style> <div class=\"vp-placeholder-thumb\"></div> <div class=\"vp-placeholder-carousel\"></div> <script> (function(document) { var placeholder = document.querySelector('.vp-placeholder'); var placeholderThumb = document.querySelector('.vp-placeholder-thumb'); var videoWidth = parseInt('1278'); var videoHeight = parseInt('720'); placeholder.style.visibility = 'visible'; }(document)); </script> </div> <div id=\"player\" class=\"player\"></div> <script> (function(document, player) { var config = 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if (!config.request) { return; } if (typeof config.request === 'object' && 'error' in config.request) { if ('html' in config.request) { document.documentElement.innerHTML = config.request.html.replace(/&lt;/g, '<').replace(/&gt;/g, '>'); } return; } var isIframe = (function() { try { return window.self !== window.top; } catch (e) { return true; } }()); if (!isIframe && /twitter/i.test(navigator.userAgent) && config.video.url) { window.location = config.video.url; } if (config.request.lang) { document.documentElement.setAttribute('lang', config.request.lang); } var fullscreenSupport = 'exitFullscreen' in document || 'webkitExitFullscreen' in document || 'webkitCancelFullScreen' in document || 'mozCancelFullScreen' in document || 'msExitFullscreen' in document || 'webkitEnterFullScreen' in document.createElement('video'); var inlineSvgSupport = (function() { var div = document.createElement('div'); div.innerHTML = '<svg/>'; return (div.firstChild && div.firstChild.namespaceURI) === 'http://www.w3.org/2000/svg'; }()); var windowsPhone = /MSIE 9/.test(navigator.userAgent) && /Windows Phone/.test(navigator.userAgent); var IE10 = /IE 10/.test(navigator.userAgent); var usePlayer = fullscreenSupport || IE10 || windowsPhone; var firstScript = document.getElementsByTagName('script')[0]; var script = document.createElement('script'); var jsDone = false; var playerObject = false; if (!inlineSvgSupport) { usePlayer = false; } if (!usePlayer) { var placeholder = document.querySelector('.vp-placeholder'); if (placeholder && placeholder.parentNode) { placeholder.parentNode.removeChild(placeholder); } } if (usePlayer) { player.className = 'player loading'; var startTime = new Date().getTime(); script.src = config.request.urls.js; firstScript.parentNode.insertBefore(script, firstScript); script['onreadystatechange' in script ? 'onreadystatechange' : 'onload'] = function() { if (!jsDone && (!this.readyState || this.readyState === 'loaded' || this.readyState === 'complete')) { jsDone = true; playerObject = new VimeoPlayer(player, config, cssDone || { link: link, startTime: startTime }); } }; var cssDone = false; var link = document.createElement('link'); link.rel = 'stylesheet'; link.href = config.request.urls.css + (typeof cacheBuster === 'undefined' ? '' : cacheBuster); document.getElementsByTagName('head')[0].appendChild(link); link.onload = function() { cssDone = true; }; } else { player.innerHTML = '<div class=\"fallback\"><iframe title=\"vimeo-player\" src=\"/video/477696225/fallback?js&amp;referrer=' + encodeURIComponent(config.request.referrer) + '\" frameborder=\"0\"></iframe></div>'; } if (!config.request.flags.dnt && !config.embed.dnt) { window._vuid = [ ['pid', config.request.session] ]; var vim = document.createElement('script'); vim.async = true; vim.src = config.request.urls.vuid_js; firstScript.parentNode.insertBefore(vim, firstScript); } }(document, document.getElementById('player'))); </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/