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
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

const regex = /[幹乾淦贛干肏操糙去塞賽]?[林賃吝拎恁你他她它祂牠](娘|媽|老師|妹|祖?(嬤|媽|罵))(的|樂|叻|垃|勒|咧|([基唧雞機激][掰歪]))?|([基唧雞機激][掰歪])/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('[幹乾淦贛干肏操糙去塞賽]?[林賃吝拎恁你他她它祂牠](娘|媽|老師|妹|祖?(嬤|媽|罵))(的|樂|叻|垃|勒|咧|([基唧雞機激][掰歪]))?|([基唧雞機激][掰歪])', 'g') const str = `幹 幹他媽的 幹你娘 乾 乾林老師 靠 靠北 靠杯 靠背 靠盃 靠腰 靠夭 哭夭 去你的 去你媽的 林北 恁北 恁娘 恁祖媽 機掰 賤 俗辣 他媽的 覽趴 懶趴 北爛 盧小 魯洨 色龜 肚爛 屌 啥小 三小 操 屁 唬爛 龜公 他奶奶的 犯賤 機車 智缺 你娘卡好 林老師 破麻 賽 操卒仔 操機歪 糙機掰 無懶趴 卡小 吃小 死魚眼 炭甲查某 糙你妹 GGININ GG IN IN GG IN IN DER 可惡 想揉 想揉 ㄈㄈ尺 英文原生： CCR Fuck off Fuck mother fucker You SOB son of a bitch Go to hell Shit-head Asshole You beast Shit fart Idiot damn it God damn God damn it hypocrite ass hole ass licker bitch phycho bastard Whore Slut Shit-head `; // 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