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

/
/

Test String

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"([^\W\dA-Z && (I|X|L|V|\.)])\1{2}").unwrap(); let string = "<H1><h><key1>SaravARi</key1><key2>*SaravARi</key2></h><body><gram n=\"\"></gram>m. <divm type=\"e\" n=\"1\">1)</divm> <i>Pfeilspitze.</i> <divm type=\"e\" n=\"2\">2)</divm> <i>Verfertiger von Pfeilen.</i> <divm type=\"e\" n=\"3\">3)</divm> <i>Fusssoldat.</i> <divm type=\"e\" n=\"4\">4)</divm> = <s>papizWa</s> ; <noti>wohl fehlerhaft für</noti> <s>padAti</s>. PW110624</body><tail><L>110623</L><pc>6211-2</pc></tail></H1> <H1><h><key1>SaravARi</key1><key2>*SaravARi</key2></h><body><gram n=\"\"></gram>m. <divm type=\"e\" n=\"1\">1)</divm> <i>Pfeilspitze.</i> <divm type=\"e\" n=\"2\">2)</divm> <i>Verfertiger von Pfeilen.</i> <divm type=\"e\" n=\"3\">3)</divm> <i>Dusssoldat.</i> <divm type=\"e\" n=\"4\">4)</divm> = <s>papizWa</s> ; <noti>wohl fehlerhaft für</noti> <s>padAti</s>. PW110624</body><tail><L>110623</L><pc>6211-2</pc></tail></H1> <H1><h><key1>SaSapada</key1><key2>SaSapada</key2></h><body><gram n=\"\"></gram>n. <i>Hasenfussstapfen.</i> <noti>so v.a.</noti> <i>worüber man leicht hinwegkommt</i> <ls>HARSHAK4.181,6.</ls> PW110959</body><tail><L>110958</L><pc>6215-2</pc></tail></H1> <H1><h><key1>svatas</key1><key2>svatas</key2></h><body><gram n=\"\"></gram>Adv. <divm type=\"e\" n=\"1\">1)</divm> = <s>svasmAt</s> <gram n=\"\"></gram>Adj. <noti>und</noti> <gram n=\"\"></gram>Subst. <gram n=\"\"></gram>m. <s>svatoM 'SAt</s> <i>vom eigenen Theile.</i> <s>tadrakzerapacAraM tvaM</s> [Page7.232-2] <s>svato vA parato 'pi vA</s> <noti>so v.a.</noti> <i>hüte dich selbst und Andere vor einem Vergehen.</i> <divm type=\"e\" n=\"2\">2)</divm> <i>aus sich (aus mir selbst , aus dir selbst</i> <noti>u.s.w.)</noti> , <i>von sich aus , von selbst</i> , <noti>d.i.</noti> <i>ohne Hinzutreten eines Andern.</i> <divm type=\"e\" n=\"3\">3)</divm> <i>von selbst</i> , <noti>so v.a.</noti> <i>naturgemäss.</i> <divm type=\"e\" n=\"4\">4)</divm> <i>vom Eigenen , vom eigenen Vermögen.</i> <noti>--</noti> <s>ca svataH</s> <ls>PAN4K4AT.III,96</ls> <noti>schlechte Lesart für</noti> <s>SASvataH</s>. PW132059</body><tail><L>132058</L><pc>7232-1</pc></tail></H1> <H1><h><key1>aNkAsya</key1><key2>aNkAsya</key2></h><body><gram n=\"\"></gram>n. <i>Diejenige Schlussscene eines Actes , welche , indem sie eine Unterbrechung herbeiführt.</i> PW890</body><tail><L>890</L><pc>1011-1</pc></tail></H1> <H1><h><key1>susaMdIpta</key1><key2>susaMdIpta</key2></h><body><gram n=\"\"></gram>Adj. <i>schön flammend</i> <ls>PAN4K4AT.</ls> <noti>VIII , 167.</noti> PW128334</body><tail><L>128333</L><pc>7172-2</pc></tail></H1>"; // result will be a tuple containing the start and end indices for the first match in the string let result = regex.captures(string); let (start, end) = match result { Some((s, e)) => (s, e), None => { // ... } }; println!("{}", &string[start, end]); }

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 Rust, please visit: https://docs.rs/regex/latest/regex/