Save & Share

  • Current Version: 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
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
Processing...

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^(.*?)(?:[._-]|(\())([a-z]{2,3})(?(2)\)|)(?:[_\W]forced)?$"; string input = @"name.eng name-eng name(eng) name(fri)_eng name(fri)(eng) name.eng.forced name(eng).forced name.(eng).forced name.fri.eng.forced name(fri).eng.forced name.(fri).eng_forced name-fri-eng.forced name_(fri)_eng.forced name(fri)_eng.forced name(friday)_eng_forced name(fri)(eng).forced I'm tying to extract the header and a 2 or 3 digit ISO 639 code from a string. The general format of a valid string is: header + <special char> + <2 or 3 digit code> + (<special char>forced) The last section <special character>forced is optional and may or may not be present but if present forced must be preceded with a special character (like . or _ or -) for it to be a considered a valid string. Examples of valid strings where the header and language code (eng) to be extracted are: name.eng name-eng name(eng) name(fri)_eng name(fri)(eng) name.eng.forced name(eng).forced name.(eng).forced name.fri.eng.forced name(fri).eng.forced name.(fri).eng_forced name-fri-eng.forced name_(fri)_eng.forced name(fri)_eng.forced name(friday)_eng_forced name(fri)(eng).forced nameeng nameeng.forced name.eng).forced name(fri)eng.forced name(friday).engforced name(fri)(eng)forced"; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx