Regular Expressions 101

Save & Share

  • Regex Version: ver. 9
  • 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

/
/
gms

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#"(?ms)<[Rr]epresentation[^>]*?[Bb]andwidth="0?[2-9]\d{6}"[\s\S]*?[Rr]epresentation>"#).unwrap(); let string = "<MPD xmlns=\"urn:mpeg:dash:schema:mpd:2011\" minBufferTime=\"PT1.500000S\" type=\"static\" mediaPresentationDuration=\"PT0H9M54.00S\" profiles=\"urn:mpeg:dash:profile:isoff-live:2011\"> <ProgramInformation moreInformationURL=\"http://gpac.sourceforge.net\"> <Title>/home/elkhatib/Documents/dash264/TestCases/2b/qualcomm/2_BBB_5Sec_MainProf/MultiRes.mpd generated by GPAC</Title> </ProgramInformation> <Period id=\"\" duration=\"PT0H9M54.00S\"> <AdaptationSet segmentAlignment=\"true\" maxWidth=\"1280\" maxHeight=\"720\" maxFrameRate=\"24\" par=\"16:9\"> <Representation id=\"1\" mimeType=\"video/mp4\" codecs=\"avc1.4d401f\" width=\"512\" height=\"288\" frameRate=\"24\" sar=\"1:1\" startWithSAP=\"1\" bandwidth=\"2000000\"> <SegmentTemplate timescale=\"12288\" duration=\"61440\" media=\"BBB_512_640K_video_$Number$.mp4\" startNumber=\"1\" initialization=\"BBB_512_640K_video_init.mp4\" /> </Representation> <Representation id=\"1\" mimeType=\"video/mp4\" codecs=\"avc1.4d401f\" width=\"512\" height=\"288\" frameRate=\"24\" sar=\"1:1\" startWithSAP=\"1\" bandwidth=\"1000000\"> <SegmentTemplate timescale=\"12288\" duration=\"61440\" media=\"BBB_512_640K_video_$Number$.mp4\" startNumber=\"1\" initialization=\"BBB_512_640K_video_init.mp4\" /> </Representation> <Representation id=\"1\" mimeType=\"video/mp4\" codecs=\"avc1.4d401f\" width=\"512\" height=\"288\" frameRate=\"24\" sar=\"1:1\" startWithSAP=\"1\" bandwidth=\"2000000\"> <SegmentTemplate timescale=\"12288\" duration=\"61440\" media=\"BBB_512_640K_video_$Number$.mp4\" startNumber=\"1\" initialization=\"BBB_512_640K_video_init.mp4\" /> </Representation> <Representation id=\"2\" mimeType=\"video/mp4\" codecs=\"avc1.4d401f\" width=\"768\" height=\"432\" frameRate=\"24\" sar=\"1:1\" startWithSAP=\"1\" bandwidth=\"4000000\"> <SegmentTemplate timescale=\"12288\" duration=\"61440\" media=\"BBB_768_1440K_video_$Number$.mp4\" startNumber=\"1\" initialization=\"BBB_768_1440K_video_init.mp4\" /> </Representation> </AdaptationSet> </Period> </MPD> "; // 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/