Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • 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
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?m)\"num_records\\":\s*(\d+)" Local $sString = ""{\"cursor\":\"\",\"hits\":3,\"results\":[{\"id\":65673,\"num_records\":14631,\"assets\":{\"ip_addresses\":14631,\"password\":14631,\"target_url\":14631,\"keyboard_languages\":14631,\"user_sys_registered_owner\":14484,\"country\":14631,\"infected_machine_id\":14631,\"email\":7346,\"username\":7285,\"user_os\":14631,\"user_hostname\":14631,\"log_id\":14631,\"infected_time\":14631,\"country_code\":14581}},{\"id\":65675,\"num_records\":2602,\"assets\":{\"display_resolution\":2602,\"ip_addresses\":2534,\"user_browser\":2602,\"password\":2602,\"target_url\":2602,\"keyboard_languages\":2602,\"user_sys_registered_owner\":2601,\"country\":2597,\"infected_machine_id\":2602,\"email\":943,\"full_name\":25,\"av_softwares\":2348,\"username\":1659,\"infected_path\":2534,\"user_os\":2602,\"log_id\":2602,\"infected_time\":2602,\"country_code\":2597,\"timezone\":2602}},{\"id\":65677,\"num_records\":139,\"assets\":{\"display_resolution\":139,\"ip_addresses\":139,\"user_browser\":139,\"password\":139,\"target_url\":139,\"keyboard_languages\":139,\"user_sys_registered_owner\":139,\"country\":139,\"infected_machine_id\":139,\"email\":3,\"full_name\":7,\"av_softwares\":139,\"username\":136,\"infected_path\":139,\"user_os\":139,\"log_id\":139,\"infected_time\":139,\"country_code\":139,\"timezone\":139}}]}"" & @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