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

r"
"
gm

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"<img\s+[\S\""'= ]{0,40}src=[\""'](?P<src>(http(s)?:)?\/\/[^\"":>]+)[\""']?"; string input = @" <!DOCTYPE html> <html lang=""zh-cn""> <head> <meta charset=""utf-8"" /> <meta name=""viewport"" content=""width=device-width, initial-scale=1"" /> <meta name=""referrer"" content=""always"" /> <title>博客园 - 代码改变世界</title> <meta name=""keywords"" content=""开发者,博客园,开发者,程序猿,程序媛,极客,编程,代码,开源,IT网站,Developer,Programmer,Coder,Geek,技术社区"" /> <meta name=""description"" content=""博客园是一个面向开发者的知识分享社区。自创建以来，博客园一直致力并专注于为开发者打造一个纯净的技术交流社区，推动并帮助开发者通过互联网分享知识，从而让更多开发者从中受益。博客园的使命是帮助开发者用代码改变世界。"" /> <link rel=""shortcut icon"" href=""//common.cnblogs.com/favicon.ico"" type=""image/x-icon"" /> <link rel=""Stylesheet"" type=""text/css"" href=""/bundles/aggsite.css?v=IlEZk4Ic2eCzcO6r0s4bGm62FAo8VZI-US_0EqUe2Bk1"" /> <link id=""RSSLink"" title=""RSS"" type=""application/rss+xml"" rel=""alternate"" href=""http://feed.cnblogs.com/blog/sitehome/rss"" /> <script src=""//common.cnblogs.com/scripts/jquery-2.2.0.min.js"" type=""text/javascript""></script> <script src=""/bundles/aggsite.js?v=wbLJNoxRMOKXYku3zcNQAABkHSQLwHZ_hyKZv8KPN1Y1"" type=""text/javascript""></script> <script async='async' src='https://www.googletagservices.com/tag/js/gpt.js'></script> <script> var googletag = googletag || {}; googletag.cmd = googletag.cmd || []; </script> <script> googletag.cmd.push(function () { googletag.defineSlot('/1090369/A1', [468, 60], 'div-gpt-ad-1547816814884-0').addService(googletag.pubads()); googletag.defineSlot('/1090369/B1', [300, 250], 'div-gpt-ad-1546331539224-0').addService(googletag.pubads()); googletag.defineSlot('/1090369/B2', [300, 250], 'div-gpt-ad-1539007469525-0').addService(googletag.pubads()); googletag.defineSlot('/1090369/B3', [300, 250], 'div-gpt-ad-1546331252242-0').addService(googletag.pubads()); googletag.defineSlot('/1090369/B4', [300, 250], 'div-gpt-ad-1546331385104-0').addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.enableServices(); }); </script> </head> <body> <div id=""wrapper""> <div id=""hd_info""> <div id=""cnts""> <div id=""site_nav_top"">代码改变世界</div> <div id=""login_area""><span id=""span_userinfo""></span></div> <div class=""clear""></div> </div> </div> <div id=""header""> <p class=""h_r_3""></p><p class=""h_r_2""></p><p class=""h_r_1""></p> <div id=""header_block""> <div id=""logo""> <h1> <a href=""https://www.cnblogs.com/"" title=""开发者的网上家园""><img src=""/images/logo_small.gif"" alt=""博客园Logo"" width=""142"" height=""55"" /></a> </h1> </div> <div class=""clear""></div> </div> <p class=""h_r_1""></p><p class=""h_r_2""></p><p class=""h_r_3""></p> </div> <div id=""nav_menu""><a href=""https://home.cnblogs.com/"">园子</a><a href=""https://news.cnblogs.com"">新闻</a><a href=""https://q.cnblogs.com/"">博问</a><a href=""https://ing.cnblogs.com/"">闪存</a><a href=""https://group.cnblogs.com/"">小组</a><a href=""https://wz.cnblogs.com/"">收藏</a><a href=""https://job.cnblogs.com/"">招聘</a><a href=""https://edu.cnblogs.com/"">班级</a><a href=""http://zzk.cnblogs.com/"">找找看</a></div> <div id=""main""> <div class=""post_nav_block_wrapper""> <ul class=""post_nav_block""> <li><a href=""/"" class=""current_nav"" >首页</a></li> <li><a href=""/pick/"" title=""编辑精选博文"">精华</a></li> <li><a href=""/candidate/"" title=""候选区的博文"">候选</a></li> <li><a href=""/news/"" title=""新闻频道最新新闻"">新闻</a></li> <li><a href=""/following"" title=""我关注博客的最新博文"">关注</a></li> <li><a href=""/aggsite/mycommented"" title=""我评论过的博文"">我评</a></li> <li><a href=""/aggsite/mydigged"" title=""我推荐过的博文"">我赞</a></li> </ul> <div class=""clear""></div> </div> <div class=""rss_link"" id=""rss_block""> <span id=""posts_refresh_tips""></span><a id=""posts_refresh"" href=""#"" class=""refresh"" title=""刷新博文列表"" onclick=""aggSite.loadCategoryPostList();return false"">刷新</a> <a 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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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx