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

/
/
i

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^\+[\d]{1}+\([\d]{3}\)+[\d]{3}+\-+[\d]{4}$|^\+[\d]{1}+\([\d]{3}\)+[\d]{3}+\s+[\d]{4}$|^\+[0-9]{1}+\([0-9]{3}\)+[0-9]{7}$|^\+[0-9]{1}+\([0-9]{3}\)+[0-9]{3}+\-+[0-9]{2}+\-+[0-9]{2}$|^\+[0-9]{1}+\([0-9]{3}\)+[0-9]{3}+\s+[0-9]{2}+\s+[0-9]{2}$|^\+[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\s+[0-9]{2}+\s+[0-9]{2}$|^\+[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\-+[0-9]{2}+\-+[0-9]{2}$|^\++[0-9]{4}+\s+[0-9]{7}$|^\+[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\s+[0-9]{4}$|^\+[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\-+[0-9]{4}$|^\++[0-9]{11}$|^[0-9]{1}+\([0-9]{3}\)+[0-9]{7}$|^[0-9]{1}+\([0-9]{3}\)+[0-9]{3}+\-+[0-9]{2}+\-+[0-9]{2}$|^[0-9]{1}+\([0-9]{3}\)+[0-9]{3}+\s[0-9]{2}+\s+[0-9]{2}$|^\([0-9]{3}\)+[0-9]{7}$|^\([0-9]{3}\)+[0-9]{3}+\-+[0-9]{2}+\-+[0-9]{2}$|^\([0-9]{3}\)+[0-9]{3}+\s+[0-9]{2}+\s+[0-9]{2}$|^[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\s+[0-9]{2}+\s+[0-9]{2}$|^[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\-+[0-9]{2}+\-+[0-9]{2}$|^[0-9]{4}+\s+[0-9]{7}$|^[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\s+[0-9]{4}$|^[0-9]{1}+\s+[0-9]{3}+\s+[0-9]{3}+\-+[0-9]{4}$|^[\d]{11}$|^[\d]{10}$|^\+[\d]{1}+\([\d]{3}\)+[\d]{2}+\s+[\d]{3}+\-+[\d]{2}$|^\+[\d]{1}+\([\d]{3}\)+[\d]{2}+\s+[\d]{3}+\s+[\d]{2}$|^\+[\d]{1}+\([\d]{3}\)+[\d]{2}+\s+[\d]{5}$|^\+[\d]{6}+\s+[\d]{3}+\-+[\d]{2}$|^\+[\d]{6}+\s+[\d]{3}+\s+[\d]{2}$|^\+[\d]{6}+\s+[\d]{5}$|^\+[\d]{4}+\s+[\d]{2}+\s+[\d]{3}+\s+[\d]{2}$|^\+[\d]{4}+\s+[\d]{2}+\s+[\d]{3}+\-+[\d]{2}$|^\+[\d]{11}$|^[\d]+\([\d]{3}\)+[\d]{2}+\s+[\d]{3}+\-+[\d]{2}$|^[\d]+\([\d]{3}\)+[\d]{2}+\s+[\d]{3}+\s+[\d]{2}$|^[\d]+\([\d]{3}\)+[\d]{2}+\s+[\d]{5}$|^[\d]{6}+\s+[\d]{3}+\-+[\d]{2}$|^[\d]{6}+\s+[\d]{3}+\s+[\d]{2}$|^[\d]{6}+\s+[\d]{5}$|^[\d]{4}+\s+[\d]{2}+\s+[\d]{3}+\s+[\d]{2}$|^[\d]{4}+\s+[\d]{2}+\s+[\d]{3}+\-+[\d]{2}$|^[\d]{3}+\-+[\d]{2}$|^[\d]{5}$"; string input = @""; RegexOptions options = RegexOptions.IgnoreCase; Match m = Regex.Match(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