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

/
/
gmi

Test String

Code Generator

Language

Generated Code

const regex = /\b(C(hief )?E(xecutive )?O(fficer)?|Direct(eur|rice)\sGénérale?|Founder|General\sManager|Owner|President|Partner|P(r[ée]sidente?)?D(irect(eur|rice))?G([ée]n[ée]rale?))\b(?!.*\b(Logistic|Industry|Industrial|Construction|Transport)\b)/gmi; // Alternative syntax using RegExp constructor // const regex = new RegExp('\\b(C(hief )?E(xecutive )?O(fficer)?|Direct(eur|rice)\\sGénérale?|Founder|General\\sManager|Owner|President|Partner|P(r[ée]sidente?)?D(irect(eur|rice))?G([ée]n[ée]rale?))\\b(?!.*\\b(Logistic|Industry|Industrial|Construction|Transport)\\b)', 'gmi') const str = `CEO at TechCorp General Manager of Construction Ltd Chief Executive Officer at GreenTech Directeur Général, Retail Co. Directrice Générale, Fashion House President of Logistics Firm Founder of Innovative Solutions Partner at Finance Group COO at Healthcare Inc. Owner of a Design Studio CTO at Software Development Firm President of HR Solutions Junior Consultant at Business Partners Freelance Marketing Advisor Investor in Tech Startups General Manager at Transport Services CEO of Logistics & Supply Founder of Non-Profit Organization Chief Executive Officer at Construction Co. Partner at Talent Acquisition Firm `; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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