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

/
/
gm

Test String

Code Generator

Language

Generated Code

const regex = /\d{1,9}(eur.*)? honoraires? exclus/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('\\d{1,9}(eur.*)? honoraires? exclus', 'gm') const str = `---------------------------------------------------------------------------------- [REGEX_1 = hors honoraires?:? (:\\s)?\\d{1,9}] ---------------------------------------------------------------------------------- prix hors honoraires 900 000 €. no prix hors honoraire 900 000 €. no prix hors honoraire: 900 000 €. no prix hors honoraires 168 000 € ttc. prix hors honoraires 600 000 € ht. prix hors honoraires 125 000 €. no prix hors honoraires 2 500 000 € pa prix hors honoraires 100 000 €. no prix hors honoraires 250 000 € h prix hors honoraires: 250 000 € h prix de vente hors honoraires : 620 000 € ---------------------------------------------------------------------------------- [REGEX_2 = \\d{1,9} ([a-zA-Z_\\/€²]{1,12}) hors honoraires?] ---------------------------------------------------------------------------------- 1 050 000 € hors honoraires 450 000 euros hors honoraires 287600 eur hors honoraires 450 ht/hc/m²/an hors honoraires 450 € /m2 ht/hc/an hors honoraires 450 m²/an/ ht hc et hors honoraires ---------------------------------------------------------------------------------- [REGEX_3 = \\d{1,9}(eur.*)? hors honoraires?] ---------------------------------------------------------------------------------- 65 000 hors honoraires 400000eur hors honoraires ---------------------------------------------------------------------------------- [REGEX_4 = honoraires? exclus:? (:\\s)?\\d{1,9}] ---------------------------------------------------------------------------------- prix honoraires exclus : 80 000 eur prix honoraires exclus : 550 000 eur prix honoraires exclus: 550 000 eur ---------------------------------------------------------------------------------- [REGEX_5 = \\d{1,9} ([a-zA-Z_\\/€²]{1,12}) honoraires? exclus] ---------------------------------------------------------------------------------- 65 000 eur honoraires exclus 400000 ht/hc/m²/an honoraires exclus ---------------------------------------------------------------------------------- [REGEX_6 = \\d{1,9}(eur.*)? honoraires? exclus] ---------------------------------------------------------------------------------- 65 000 honoraires exclus 400000eur ht/hc/m²/an honoraires exclus 400000eur honoraires exclus [GOOD ONE] prix honoraires exclus honoraires exclus prix hors honoraires bail 30/06/22 hors honoraires `; // 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