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

Substitution

Processing...

Code Generator

Generated Code

#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox Local $sRegex = "(?m)("ControlLabel": ")(.*)(",\n\s*)("ControlOptions":.*)(Select all that apply:\\r\\n)(.*)(\n\s*"ControlType": ")(OneResponse")" Local $sString = " }, {" & @CRLF & _ " "ControlLabel": "How the post-op instructions were given"," & @CRLF & _ " "ControlOptions": "Select all that apply:\r\ncomputer generated\r\nverbal\r\nwritten"," & @CRLF & _ " "ControlType": "OneResponse"," & @CRLF & _ " "Descript": "Post-Op Instructions"" & @CRLF & _ " }, {" & @CRLF & _ " "ControlLabel": "The degree of scaling"," & @CRLF & _ " "ControlOptions": "general\r\nlight"," & @CRLF & _ " "ControlType": "MultiResponse"," & @CRLF & _ " "Descript": "Prophy Scaling"" & @CRLF & _ " }, {" & @CRLF & _ " "ControlLabel": "The quadrants"," & @CRLF & _ " "ControlOptions": "Select all that apply:\r\nUpper Right\r\nUpper Left\r\nLower Right\r\nLower Left"," & @CRLF & _ " "ControlType": "OneResponse"," & @CRLF & _ " "Descript": "Quadrant-Select Multiple"" Local $sSubst = "\1\2. Select all that apply.\3\4\6\7MultiResponse"" Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst) MsgBox($MB_SYSTEMMODAL, "Result", $sResult)

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