Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

re = /^(Depense|Recette)_Aller_\d*_*(FEDER|RR974|POCT)_\d{2}_\d{4}_\d{1,2}_\d+C\w*.xml$/ str = 'Depense_Aller_4689.xml : flux PJ seul, bordereau déjà envoyé, à ne pas signer Depense_Aller_4659_661C.xml : flux complet, à signer DAF Depense_Aller_FEDER_01_2017_1_19C.xml Depense_Aller_FEDER_01_2017_1_19C_Auto.xml Depense_Aller_7864_FEDER_01_2017_2_19C_Auto.xml Depense_Aller_4344_SMPRR_01_2017_2_34C_Auto.xml Depense_Aller_4344_RR974_01_2017_6_566C_Auto.xml Depense_Aller_4038_RR974_01_2017_473C_Auto.xml Depense_Aller_3469_RR974_01_2017_271C_Auto.xml : flux complet paye, à signer RH Depense_Aller_4271_FEDER_01_2016_5A_Auto.xml : flux en annulation, à ne pas signer Depense_Aller_2649_RR974_01_2017_5C_Auto.xml : flux indemnités élus Région, à signer par ? Depense_Aller_3222_RR974_01_2017_216C_Auto.xml : flux indemnités élus CESER, à signer par ? Depense_Aller_3222_RR974_01_2017_219C_Auto.xml : flux indemnités élus CCEE, à signer par ? Appgfi\\wwwGFTEST\\astre\\astromate\\pes\\recette : Recette_Aller_4271_RR974_01_2017_6C_Auto.xml : flux recette, à signer DAF Recette_Aller_4271_RR974_01_2016_21A_Auto.xml : flux recette en annulation, à ne pas signer ' subst = '' result = str.gsub(re, subst) # Print the result of the substitution puts result

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html