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#""hash":"(.*?)""#).unwrap(); let string = "[{\"added_on\":1587102956,\"amount_left\":0,\"auto_tmm\":false,\"availability\":-1,\"category\":\"radarr\",\"completed\":1218638934,\"completion_on\":1587108704,\"dl_limit\":-1,\"dlspeed\":0,\"downloaded\":1220894674,\"downloaded_session\":0,\"eta\":8640000,\"f_l_piece_prio\":false,\"force_start\":true,\"hash\":\"87802183fc647548ec6efe18feb16149522f6aa0\",\"last_activity\":1587119220,\"magnet_uri\":\"magnet:?xt=urn:btih:87802183fc647548ec6efe18feb16149522f6aa0&dn=Fantasia%202000%20(1999)%20%5b1080p%5d%20%5bYTS.AG%5d&tr=udp%3a%2f%2ftracker.coppersurfer.tk%3a6969%2fannounce&tr=udp%3a%2f%2f9.rarbg.com%3a2710%2fannounce&tr=udp%3a%2f%2fp4p.arenabg.com%3a1337&tr=udp%3a%2f%2ftracker.leechers-paradise.org%3a6969&tr=udp%3a%2f%2ftracker.internetwarriors.net%3a1337&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.zer0day.to%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.leechers-paradise.org%3a6969%2fannounce&tr=udp%3a%2f%2fcoppersurfer.tk%3a6969%2fannounce\",\"max_ratio\":-1,\"max_seeding_time\":-1,\"name\":\"Fantasia 2000 (1999) [1080p] [YTS.AG]\",\"num_complete\":22,\"num_incomplete\":4,\"num_leechs\":0,\"num_seeds\":0,\"priority\":0,\"progress\":1,\"ratio\":0.1782183661159947,\"ratio_limit\":-2,\"save_path\":\"/Volumes/1049/Media/\",\"seeding_time_limit\":-2,\"seen_complete\":1587118087,\"seq_dl\":false,\"size\":1218638934,\"state\":\"forcedUP\",\"super_seeding\":false,\"tags\":\"\",\"time_active\":13224,\"total_size\":1218638934,\"tracker\":\"udp://tracker.coppersurfer.tk:6969/announce\",\"up_limit\":-1,\"uploaded\":217585854,\"uploaded_session\":128831791,\"upspeed\":0}]"; // 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/