Paul Ligocki

Regular Expression RegEx RegExp Resources

Regular Expression RegEx RegExp Resources

Quantifiers

  • *
    Zero of more of the character that immediately precedes it
  • +
    One or more of the character that immediately precedes it
  • ?
    Zero or One of the character that immediately precedes it

Special Symbols

  • ^
    Start of line
  • $
    End of line
  • \A
    Start of string
  • \z
    End of string
  • .
    Any single character
  • \s
    Any whit space character
  • \S
    Any non white space character
  • \d
    Any digit
  • \D
    Any non digit
  • \w
    Any word character (letter, number or underscore)
  • \W
    Any non word character
  • \b
    Any word boundary

Braces

  • {}
    Length Quantifier
  • ()
    Group
    • ?<>
      Group Name
    • ?:
      Non Capturing Group
  • []
    Set, array, collection

Look Ahead

(?=)

Matches a string pattern to the right but does not include it in the return

Look Behind

(?>=)
(?<!) Negative

Matches a string pattern ti the left but does not include it in the return

DotNet RegEx Class

[regex]::Match()

Searches an input string for a substring that matches a regular expression pattern and returns the first occurrence as a single Match object

[regex]::Matches()

Searches an input string for all occurrences of a regular expression and returns all the matches

  • Regexr.com
  • Regex101.com
  • regexhero.net/tester/ (requires Silver Light)
  • https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex?view=net-6.0

paulligocki

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