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

/
/
gm

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 $sRegex = "(?m)^([^\W_][\w\-\.]*[^\W_])(@[^\W_][a-zA-Z0-9\-]+[^\W_])(\.[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)?[^\W_])$" Local $sString = "// User tests" & @CRLF & _ "abc@test.test" & @CRLF & _ "123@test.test" & @CRLF & _ "abc123@test.test" & @CRLF & _ "abc.123@test.test" & @CRLF & _ "abc-123@test.test" & @CRLF & _ "abc_123@test.test" & @CRLF & _ "abc.123-def@test.test" & @CRLF & _ "abc.123_def@test.test" & @CRLF & _ "abc-123_def@test.test" & @CRLF & _ "" & @CRLF & _ "// Domain tests" & @CRLF & _ "test@abc.test" & @CRLF & _ "test@123.test" & @CRLF & _ "test@abc-123.test" & @CRLF & _ "" & @CRLF & _ "// TLD tests" & @CRLF & _ "test@test.com" & @CRLF & _ "test@test.com.br" & @CRLF & _ "" & @CRLF & _ "//Invalid space tests" & @CRLF & _ " test@test.test" & @CRLF & _ "te st@test.test" & @CRLF & _ "test @test.test" & @CRLF & _ "test@ test.test" & @CRLF & _ "test@te st.test" & @CRLF & _ "test@test .test" & @CRLF & _ "test@test. test" & @CRLF & _ "test@test.te st" & @CRLF & _ "test@test.test " & @CRLF & _ "" & @CRLF & _ "//Invalid user tests" & @CRLF & _ ".abc123@test.test" & @CRLF & _ "abc123.@test.test" & @CRLF & _ "-abc123@test.test" & @CRLF & _ "abc123-@test.test" & @CRLF & _ "_abc123@test.test" & @CRLF & _ "abc123_@test.test" & @CRLF & _ "" & @CRLF & _ "//Invalid domain tests" & @CRLF & _ "test@.abc123.test" & @CRLF & _ "test@abc123..test" & @CRLF & _ "test@-abc123.test" & @CRLF & _ "test@abc123-.test" & @CRLF & _ "test@_abc123.test" & @CRLF & _ "test@abc_123.test" & @CRLF & _ "test@abc123_.test" & @CRLF & _ "" & @CRLF & _ "//Invalid TLD tests" & @CRLF & _ "test@test.abc." & @CRLF & _ "test@test.-abc" & @CRLF & _ "test@test.ab-c" & @CRLF & _ "test@test.abc-" & @CRLF & _ "test@test._abc" & @CRLF & _ "test@test.ab_c" & @CRLF & _ "test@test.abc_" 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