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

/
/
gmU

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

const regex = /<select(?:(?!<\/select)[\n\s\S])*data-level="2"[\n\s\S]*?<\/select>/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('<select(?:(?!<\\\/select)[\\n\\s\\S])*data-level="2"[\\n\\s\\S]*?<\\\/select>', 'gm') const str = `<div class="lsd-search-filter lsd-col-10"> <label for="lsd_search_10574_listdom-location">Regions</label> <div class="lsd-hierarchical-dropdowns" id="lsd_search_10574_listdom-location_wrapper" data-for="listdom-location" data-id="lsd_search_10574_listdom-location" data-max-levels="2" data-name="sf-listdom-location" data-hide-empty="0"> <select class="listdom-location" name="sf-listdom-location" id="lsd_search_10574_listdom-location_1" placeholder="Select Region" data-level="1"> <option value="">Select Region</option> <option class="lsd-option lsd-parent-0" value="289">Region 1</option> <option class="lsd-option lsd-parent-0" value="391">Region 2</option> <option class="lsd-option lsd-parent-0" value="290">Region 3</option> </select> <select class="listdom-location" name="" id="lsd_search_10574_listdom-location_2" placeholder="Select Region" data-level="2"> <option value="">Select Region</option> <option class="lsd-option lsd-parent-289" value="291">Area 1</option> <option class="lsd-option lsd-parent-289" value="292">Area 2</option> </select> </div> </div>`; const subst = ``; // The substituted value will be contained in the result variable const result = str.replace(regex, subst); console.log('Substitution result: ', 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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions