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

/
/
gmi

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"(?mi)(\b\d\d[-|\s]\d\b)\s(\b[a-z]+\b)").unwrap(); let string = "57-61 P D DeS, 62-4 Dodge 880, 57-64 C 39-56 P, D, 40-52 DeS, 53-4 DeS except wagon, 55-6 DeS Fireflite, 55-6 DeS Firedome except wagon, 40-52 C 6 cyl, 53-6 C except Imp, wagon, LWB 57-8 C, I, 60 with model E AC, PP2, PD4, High Performance, PD1, PD2, PS1, PS3, PC1, PC2, PC3, PY1, 61 with model F AC RP2 Hipo, DeS, C, Imp, 61 Dart 6, 62 P, D 6 without air, 62 C 300 and Newport, 62 P, D with 361, 63 P, D 6 62 P Valiant, Lancer with model G AC, 64 Val, Dart 273, 318, VD2 361, 383 with air and towing, 65 P, D all with 273, 318 and no air, 63-8 DT C500 with 318 and air, 69 P, D exc. Belv. Cor, 70-72 B,J,R,W with 318, 73 B,J,R,W,P,D with 318, 360"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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/