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

/
/
g

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 = "^gmai|gm(aa?|s|i)(a?|u).*" Local $sString = "g-mail.com" & @CRLF & _ "g.mail.com" & @CRLF & _ "gailmail.com" & @CRLF & _ "gamail.com" & @CRLF & _ "gaol.com" & @CRLF & _ "geeemail.com" & @CRLF & _ "gemail.com" & @CRLF & _ "gfmail.com" & @CRLF & _ "ggmail.com" & @CRLF & _ "gimail.com" & @CRLF & _ "gmai.com" & @CRLF & _ "gmai9l.com" & @CRLF & _ "gmaiil.com" & @CRLF & _ "gmail" & @CRLF & _ "gmail." & @CRLF & _ "gmail..com" & @CRLF & _ "gmail.c" & @CRLF & _ "gmail.cim" & @CRLF & _ "gmail.cm" & @CRLF & _ "gmail.co" & @CRLF & _ "gmail.com" & @CRLF & _ "gmail.com." & @CRLF & _ "gmail.com.com" & @CRLF & _ "gmail.com101" & @CRLF & _ "gmail.com2014505140" & @CRLF & _ "gmail.com8206" & @CRLF & _ "gmail.comalexandrasceboldsecretary" & @CRLF & _ "gmail.comaol.com" & @CRLF & _ "gmail.combchan43460" & @CRLF & _ "gmail.comc" & @CRLF & _ "gmail.comceciliaschiera" & @CRLF & _ "gmail.comcolecole.cc1" & @CRLF & _ "gmail.comi" & @CRLF & _ "gmail.comil.com" & @CRLF & _ "gmail.comj" & @CRLF & _ "gmail.comjamesesber" & @CRLF & _ "gmail.coml.com" & @CRLF & _ "gmail.comleponto" & @CRLF & _ "gmail.comll" & @CRLF & _ "gmail.comlwilliams102" & @CRLF & _ "gmail.comm" & @CRLF & _ "gmail.comment.com" & @CRLF & _ "gmail.commipg820" & @CRLF & _ "gmail.comn" & @CRLF & _ "gmail.comnaka" & @CRLF & _ "gmail.comnr.aidan.collins" & @CRLF & _ "gmail.comol.com" & @CRLF & _ "gmail.comorapa0013" & @CRLF & _ "gmail.con" & @CRLF & _ "gmail.coom" & @CRLF & _ "gmail.cpm" & @CRLF & _ "gmail.cvom" & @CRLF & _ "gmail.gmail.com" & @CRLF & _ "gmail.net" & @CRLF & _ "gmail.om" & @CRLF & _ "gmail.oom" & @CRLF & _ "gmail.you" & @CRLF & _ "gmail1.com" & @CRLF & _ "gmail8203.com" & @CRLF & _ "gmailc.com" & @CRLF & _ "gmailc.om" & @CRLF & _ "gmailcom" & @CRLF & _ "gmailfurman.com" & @CRLF & _ "gmaill.com" & @CRLF & _ "gmaillcom" & @CRLF & _ "gmailmgmtcom" & @CRLF & _ "gmails.com" & @CRLF & _ "gmailus.com" & @CRLF & _ "gmaiol.com" & @CRLF & _ "gmal.com" & @CRLF & _ "gmale.com" & @CRLF & _ "gmall.com" & @CRLF & _ "gmaol.com" & @CRLF & _ "gmauil.com" & @CRLF & _ "gmial.com" & @CRLF & _ "gmil.com" & @CRLF & _ "gmila.com" & @CRLF & _ "gmmail.com" 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