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

/
/
msi

Test String

Substitution

Processing...

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#"(?msi)(?smi)^.*tag="[A-Z]_([A-Z]{2})_(\d{4}).*$"#).unwrap(); let string = "<?xml version=\"1.0\"?> -<PEGraphic gridSpaceY=\"100\" gridSpaceX=\"100\" bkgdImage=\"\" gridColor=\"#333333\" paperColor=\"#000000\" width=\"19600\" height=\"14200\" version=\"5\"> <Font height=\"120\" name=\"Arial\"/> -<Polyline backFill=\"yes\" backColor=\"#FFFFFF\"> <Location right=\"6020\" bottom=\"12445\" left=\"6018\" top=\"11741\"/> <Pen width=\"2\" style=\"solid\" color=\"#00FF00\"/> <Brush style=\"hollow\" color=\"#00FF00\"/> <Point y=\"11741\" x=\"6019\"/> <Point y=\"12445\" x=\"6019\"/> </Polyline> -<Polyline backFill=\"yes\" backColor=\"#E0E0E0\"> <Location right=\"3365\" bottom=\"12835\" left=\"3363\" top=\"11741\"/> <Pen width=\"2\" style=\"solid\" color=\"#00FF00\"/> <Brush style=\"hollow\" color=\"#00FF00\"/> <Point y=\"11741\" x=\"3364\"/> <Point y=\"12835\" x=\"3364\"/> </Polyline> -<Polyline backFill=\"yes\" backColor=\"#FFFFFF\"> <Location right=\"4627\" bottom=\"6800\" left=\"4521\" top=\"5100\"/> <Pen width=\"2\" style=\"solid\" color=\"#00FF00\"/> <Brush style=\"hollow\" color=\"#00FF00\"/> <Datasource stepped=\"no\" server=\"USFRPVMESPOLYOL\" map=\"IP_DIMAP\" field=\"VAL\" tag=\"p_dc_1730\"/> -<Animation on=\"yes\"> <AnimationRange color=\"#666666\" image=\"\" text=\"act sp\" max=\"0\" min=\"0\" index=\"1\"/> <AnimationRange color=\"#00FF00\" image=\"\" text=\"act sp\" max=\"1\" min=\"1\" index=\"2\"/> </Animation> <Point y=\"5100\" x=\"4627\"/> <Point y=\"6800\" x=\"4627\"/> </Polyline> -<Polyline backFill=\"yes\" backColor=\"#FFFFFF\"> <Location right=\"3719\" bottom=\"4394\" left=\"1918\" top=\"3300\"/> <Pen width=\"2\" style=\"solid\" color=\"#00FF00\"/> <Brush style=\"hollow\" color=\"#00FF00\"/> <Datasource stepped=\"no\" server=\"USFRPVMESPOLYOL\" map=\"\" field=\"VAL\" tag=\"P_DC_2103\"/> -<Animation on=\"yes\"> <AnimationRange color=\"#666666\" image=\"\" text=\"act sp\" max=\"0\" min=\"0\" index=\"1\"/> <AnimationRange color=\"#00FF00\" image=\"\" text=\"act sp\" max=\"1\" min=\"1\" index=\"2\"/> </Animation> <Point y=\"4394\" x=\"3718\"/> <Point y=\"4098\" x=\"3718\"/> <Point y=\"4098\" x=\"1918\"/> <Point y=\"3300\" x=\"1918\"/> </Polyline> "; let substitution = "CG $1($2)"; // result will be a String with the substituted value let result = regex.replace(string, substitution); println!("{}", result); }

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/