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Regex Quick Reference

, 25 Jun 2013 CPOL
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A convenient Regex overview.

Characters - single character of a certain type


word character


non-word character










carriage return


line feed






character by hex value



Quantifiers - specify number of times to match


zero or one


n times


zero or more


n or more times


one or more

{n[4], m}

n to m times

Ranges - specify a range of accepted values

[ abc ]

a,b, or c

[^ abc ]

not a,b, or c


a, c, or anything in between


either a or c

Anchors - specify a certain position to match


word boundary


not word boundary


start of word


end of word


start of line


end of line

Assertions - match a pattern without consuming


positive look-ahead


negative look-ahead


positive look-behind


negative look-behind

Groups - multiple characters grouped together


group with back-reference


group with named back-reference


refer to a back-referenced group


group without back-reference

Modifiers - specify how the regex engine searches


case insensitive


case sensitive


dot matches newline


dot does not match newline


ignore pattern spacing


  • [1] a specific character’s hexadecimal value
  • [2] an integer greater than 0
  • [3] an integer greater than or equal to 0
  • [4] an integer greater than or equal to 0
  • [5] a RegEx pattern
  • [6] the index of a group in a RegEx pattern
  • [7] the index of a group in a RegEx pattern


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Web Developer JBH Works
United States United States
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Comments and Discussions

GeneralMy vote of 5 Pin
gramacha26-Jun-13 3:51
membergramacha26-Jun-13 3:51 
Questiongud article Pin
harshal768926-Jun-13 2:48
memberharshal768926-Jun-13 2:48 
QuestionAbout some example. Pin
csharpbd26-Jun-13 2:21
membercsharpbd26-Jun-13 2:21 
QuestionBetter documentation-2 Pin
Prasad Khandekar25-Jun-13 22:54
professionalPrasad Khandekar25-Jun-13 22:54 
QuestionA better documentation Pin
morgex25-Jun-13 22:24
membermorgex25-Jun-13 22:24 

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