Regular Expressions 101

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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

/
/
gmx

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 $sRegex = "(?mx)# Leap Years are any year that can be evenly divided by 4 " & @CRLF & _ "# (such as 2012, 2016, etc)" & @CRLF & _ "# • except if it can be evenly divided by 100" & @CRLF & _ "# then it isn't (such as 2100, 2200, etc)" & @CRLF & _ "# • except if it can be evenly divided by 400," & @CRLF & _ "# then it is (such as 2000, 2400)" & @CRLF & _ "# https://www.mathsisfun.com/leap-years.html" & @CRLF & _ "# -------------------------------------------------" & @CRLF & _ "# verify date dd/mm/yyyy; possible separators: -.,/" & @CRLF & _ "# valid year range: 0000-9999" & @CRLF & _ "" & @CRLF & _ "^ # start anchor" & @CRLF & _ "" & @CRLF & _ "# precheck xx-xx-xxxx,... add new separators here" & @CRLF & _ "(?=\d{2}([-.,\/])\d{2}\1\d{4}$)" & @CRLF & _ "" & @CRLF & _ "(?: # day-check: non caturing group" & @CRLF & _ "" & @CRLF & _ " # days 01-28" & @CRLF & _ " 0[1-9]|1\d|[2][0-8]| " & @CRLF & _ "" & @CRLF & _ " # february 29d check for leap year: all 4y / 00 years: only each 400" & @CRLF & _ " # 0400,0800,1200,1600,2000,..." & @CRLF & _ " 29" & @CRLF & _ " (?!.02. # not if feb: if not ..." & @CRLF & _ " (?!" & @CRLF & _ " # 00 years: exclude !0 %400 years" & @CRLF & _ " (?!(?:[02468][1-35-79]|[13579][0-13-57-9])00)" & @CRLF & _ "" & @CRLF & _ " # 00,04,08,12,... " & @CRLF & _ " \d{2}(?:[02468][048]|[13579][26])" & @CRLF & _ " )" & @CRLF & _ " )|" & @CRLF & _ "" & @CRLF & _ " # d30 negative lookahead: february cannot have 30 days" & @CRLF & _ " 30(?!.02)|" & @CRLF & _ "" & @CRLF & _ " # d31 positive lookahead: month up to 31 days" & @CRLF & _ " 31(?=.(?:0[13578]|10|12))" & @CRLF & _ "" & @CRLF & _ ") # eof day-check" & @CRLF & _ "" & @CRLF & _ "# month 01-12" & @CRLF & _ ".(?:0[1-9]|1[012])" & @CRLF & _ "" & @CRLF & _ "# year 0000-9999" & @CRLF & _ ".\d{4}" & @CRLF & _ "" & @CRLF & _ "$ # end anchor" Local $sString = "29/02/0000" & @CRLF & _ "29/02/0100" & @CRLF & _ "29/02/0200" & @CRLF & _ "29/02/0300" & @CRLF & _ "29/02/0400" & @CRLF & _ "29/02/0500" & @CRLF & _ "29/02/0600" & @CRLF & _ "29/02/0700" & @CRLF & _ "29/02/0800" & @CRLF & _ "29/02/0900" & @CRLF & _ "29/02/1000" & @CRLF & _ "29/02/1100" & @CRLF & _ "29/02/1200" & @CRLF & _ "29/02/1300" & @CRLF & _ "29/02/1400" & @CRLF & _ "29/02/1500" & @CRLF & _ "29/02/1600" & @CRLF & _ "29/02/1700" & @CRLF & _ "29/02/1800" & @CRLF & _ "29/02/1900" & @CRLF & _ "29/02/2000" & @CRLF & _ "29/02/2100" & @CRLF & _ "29/02/2200" & @CRLF & _ "29/02/2300" & @CRLF & _ "29/02/2400" & @CRLF & _ "29/02/2500" 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