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

@"
"
gmx

Test String

Substitution

Processing...

Code Generator

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @" (?<firstcapture> ~Start [^~]* ) #_(3) (?<randomStuff> .*? ) #_(4) (?<loop_first> #_(5 start) (?: ~ (?: LOOP ) \d [^~] ) ( .*? ) # (1) ) #_(5 end) (?: (?<loop_middle> #_(6 start) (?: (?: ~ (?: LOOP ) \d [^~] ) .*? )* ) #_(6 end) (?<loop_last> #_(7 start) (?: ~ (?: LOOP ) \d [^~] ) ( .*? ) # (2) ) #_(7 end) )? (?<end> ~End [ ] stuff~ ) #_(8) "; string substitution = @"${firstcapture}${randomStuff}${loop_last}${loop_middle}${loop_first}${end}"; string input = @" BlahBlahBlah~Start capture~Yadda~Yadda~Yadda~LOOP1 hello1~LOOP2 hello2~LOOP3 hello3~End stuff~ BlahBlahBlah~Start capture~Yadda~Yadda~Yadda~LOOP1 hello1~LOOP2 hello2~End stuff~ BlahBlahBlah~Start capture~Yadda~Yadda~Yadda~LOOP1 hello1~LOOP3 hello3~End stuff~ BlahBlahBlah~Start capture~Yadda~Yadda~Yadda~LOOP1 hello1~End stuff~ "; RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace; Regex regex = new Regex(pattern, options); string result = regex.Replace(input, substitution); } }

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