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

/
/
gmi

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"<\w+.*?([\w-]+=[""']*\s*(?:\w+\s*)*[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\s*(?:['""]?(?:\w+\s*)*['""]?)?[""']*).*?>"; string input = @"<br data-a1=""nope"" attr="" jepp@get.me "" data-a2=""nope""> <br data-a1=""nope"" attr=' jepp@get.me ' data-a2=""nope""> <br data-a1=""nope"" attr=jepp@get.me data-a2=""nope""> <br data-a1=""nope"" attr="" jepp@get.me "" data-a2=""nope""/> <br data-a1=""nope"" attr="" jepp@get.me "" data-a2=""nope"" /> <tag data-a1=""nope"" attr="" jepp@get.me "" data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr=' jepp@get.me ' data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr=jepp@get.me data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr="" additional text jepp@get.me 'additional text'"" data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr="" additional text jepp@get.me additional text"" data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr=' additional text jepp@get.me ""additional text""' data-a2=""nope"">text</tag> <tag data-a1=""nope"" attr="" jepp@get.me jeppagain@get.me "" data-a2=""nope"">text</tag> abc dont@get.me 123 <input value=""please@get.me"">xyz abc dont@get.me 123 <tag1 att1=""val1"" email1=""please@get.me"">xyz abc dont@get.me 123 <tag2 att1=""val1"" email2=""please@get.me"" att1=""val1"">xyz <tag2 att1=""val1"" email3='please@get.me' att1=""val1"">xyz <tag2 att1=""val1"" email4=please@get.me att1=""val1"">xyz <tag2 att1=""val1"" email5="" please@get.me "" att1=""val1"">xyz <tag2 att1=""val1"" email6=' please@get.me ' att1=""val1"">xyz <tag data-yeah-also-valid-attr-name=""please@get.me"">xyz <tag data-yeah-attr=""please@get.me""> <tag data-yeah-attr='please@get.me'> <tag data-yeah-attr=please@get.me> <tag data-yeah-attr=""'please@get.me'""> <tag data-yeah-attr='""please@get.me""'>"; RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase; foreach (Match m in Regex.Matches(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