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

/
/
mug

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^(?=.{10,255}$)(?=.{4,64}@)[A-z0-9]+(?:[.-][A-z0-9]+)*@[A-z0-9]+(?:[.-][A-z0-9]+)*\.[A-z]+$"; string input = @"a-b.de@fn.cdpdodo -abde@fn.co _abde@_fn.co .abde@fn.co abde_@fn.co ab_de@_f------n.co abdسيبe@fn.co abde@fn.co ab_nnnn___0---....................-----de@fn.f.co abde@.fn.f.co .......abde@fn.f.co fkb-----kkkabde@fn.f.co f3.f3.f3.f3.fff3@gmail.com qowijdoqiwjdoqwi@coeoicmoei.ecpomep.d.docimequo a23456789a123456789b123456789c123456789d123456789e123456789f1234@ex.com a23456789a123456789b123456789c123456789d123456789e123456789f12345@ex.com wijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwij@coeo444--icmoei.ecpomepocime wijdoqiwjdoqwij@coeo444--icmoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecpomepocime wijdoqiwjdoqwij@coeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmoei.ecpomepocime wijdoqiwjdoqwij@coeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmoei.ecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocime [\w.-]{2,}\.[A-z]{2,} ^[A-z0-9][\w.-]{0,64}[A-z0-9]@(?:[A-z0-9-]{1,63}\.){1,3}[A-z]{2,63}$"; RegexOptions options = RegexOptions.Multiline | RegexOptions.CultureInvariant; 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