Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

/
/
gms

Test String

Code Generator

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?ms)^\s*(enum[^{]*)\s*({)\s*([^}]+)\s*(};)" Local $sString = "#include <iostream>" & @CRLF & _ " " & @CRLF & _ "// enum that takes 16 bits" & @CRLF & _ "enum smallenum: int16_t" & @CRLF & _ "{" & @CRLF & _ " a," & @CRLF & _ " b," & @CRLF & _ " c" & @CRLF & _ "};" & @CRLF & _ " " & @CRLF & _ " " & @CRLF & _ "// color may be red (value 0), yellow (value 1), green (value 20), or blue (value 21)" & @CRLF & _ "enum color" & @CRLF & _ "{" & @CRLF & _ " red," & @CRLF & _ " yellow," & @CRLF & _ " green = 20," & @CRLF & _ " blue" & @CRLF & _ "};" & @CRLF & _ " " & @CRLF & _ "// altitude may be altitude::high or altitude::low" & @CRLF & _ "enum class altitude: char" & @CRLF & _ "{ " & @CRLF & _ " high='h'," & @CRLF & _ " low='l', // C++11 allows the extra comma" & @CRLF & _ "}; " & @CRLF & _ " " & @CRLF & _ "// the constant d is 0, the constant e is 1, the constant f is 3" & @CRLF & _ "enum" & @CRLF & _ "{" & @CRLF & _ " d," & @CRLF & _ " e," & @CRLF & _ " f = e + 2" & @CRLF & _ "};" & @CRLF & _ " " & @CRLF & _ "//enumeration types (both scoped and unscoped) can have overloaded operators" & @CRLF & _ "std::ostream& operator<<(std::ostream& os, color c)" & @CRLF & _ "{" & @CRLF & _ " switch(c)" & @CRLF & _ " {" & @CRLF & _ " case red : os << "red"; break;" & @CRLF & _ " case yellow: os << "yellow"; break;" & @CRLF & _ " case green : os << "green"; break;" & @CRLF & _ " case blue : os << "blue"; break;" & @CRLF & _ " default : os.setstate(std::ios_base::failbit);" & @CRLF & _ " }" & @CRLF & _ " return os;" & @CRLF & _ "}" & @CRLF & _ " " & @CRLF & _ "std::ostream& operator<<(std::ostream& os, altitude al)" & @CRLF & _ "{" & @CRLF & _ " return os << static_cast<char>(al);" & @CRLF & _ "}" & @CRLF & _ " " & @CRLF & _ "int main()" & @CRLF & _ "{" & @CRLF & _ " color col = red;" & @CRLF & _ " altitude a;" & @CRLF & _ " a = altitude::low;" & @CRLF & _ " " & @CRLF & _ " std::cout << "col = " << col << '\n'" & @CRLF & _ " << "a = " << a << '\n'" & @CRLF & _ " << "f = " << f << '\n';" & @CRLF & _ "}" Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH) Local $aFullArray[0] For $i = 0 To UBound($aArray) -1 _ArrayConcatenate($aFullArray, $aArray[$i]) Next $aArray = $aFullArray ; Present the entire match result _ArrayDisplay($aArray, "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 AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm