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

r"
"

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(?P<remote_addr>(?:^|\b(?<!\.))(?:1?\d\d?|2[0-4]\d|25[0-5])(?:\.(?:1?\d\d?|2[0-4]\d|25[0-5])){3}(?=$|[^\w.]))\s-\s(?P<remote_usr>-|[a-z_][a-z0-9_]{0,30})\s(?P<date_time>\[(?P<date>[0-2][0-9]\/\w{3}\/[12]\d{3}):(?P<time>\d\d:\d\d:\d\d).*\])\s(?P<request>\""(?P<req_method>GET|POST|HEAD|PUT|DELETE|CONNECT|OPTIONS|TRACE|PATCH)\s(?P<req_uri>\/[^\s]*)\s(?P<http_ver>HTTP/\d\.\d)\"")\s(?P<status>\d{3})\s(?P<body_byte_sent>\d+)\s\""(?P<http_referer>[^\s]+)\""\s\""(?P<user_agent>[^\""]+)\""\s\""(?P<forward_for>[^\""]+)\"""; string input = @"110.233.182.14 - - [03/Aug/2017:00:52:02 +0900] ""GET / HTTP/1.1"" 200 9017 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"" ""110.233.182.14"""; Match m = Regex.Match(input, pattern); 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