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

/
/
i

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"<img(?:[\s\w=""]+)src=""([^""]+)""(?:[\s\w=""]*)\/?>"; string input = @"<img src=""image1.jpg"" width=""200"" height=""200""> <div>\r\n<h2 class=\""ng-binding\"" style=\""text-align: center;\""><span style=\""color: #ff0000;\"">قيولي50 درصدي دانش آموزان در آزمون تيزهوشان</span></h2>\r\n</div>\r\n<div class=\""ng-scope\"" style=\""text-align: center;\"">\r\n<div class=\""groupsRowSeperator\"">&nbsp;</div>\r\n<div id=\""contextData\"">\r\n<h3 class=\""ng-scope\""><span style=\""color: #008000;\"">افتخار آفريني تيزهوشاني&nbsp;</span></h3>\r\n<h3 class=\""ng-scope\""><span style=\""color: #800080;\"">قبولي50 درصدي دانش آموزان دبستان هوشمند شهيد مهدوي&nbsp;در آزمون تيزهوشان&nbsp;سال تحصيلي&nbsp;99-98&nbsp;برگ زرين ديگري براي شما اولياي گرامي و همكاران محترم و نتيجه اطميناني بود كه به هم داشتيم.</span></h3>\r\n<h3 class=\""ng-scope\""><span style=\""color: #800080;\"">اين موفقيت بزرگ را به كليه دانش آموزان عزيز ، والدين گرامي ، معلمين دلسوز ، همكاران پرتلاش دبستان هوشمند شهيد مهدوي تبريك و تهنيت عرض مي نمائيم.</span></h3>\r\n<p class=\""ng-scope\"">&nbsp;</p>\r\n<p class=\""ng-scope\""><img src=\""http://mahdavi-smart-school.ir/upload/5/akhbar/97-98/IMG-20190805-WA0014.jpg\"" alt=\""\"" width=\""423\"" height=\""1060\"" /></p>\r\n</div>\r\n</div>\r\n<div class=\""CommentBox\"" style=\""text-align: center;\"">&nbsp;</div>"; RegexOptions options = RegexOptions.IgnoreCase; Match m = Regex.Match(input, pattern, options); Console.WriteLine("'{0}' found at index {1}", m.Value, m.Index); } }

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