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

/
/
g

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "ggg"; final String string = "The_Hink\n" + "8\n" + "G\n" + "Mr.Lol https://namemc.com/profile/Mr.LoL/6e27dd0e\n" + "$ https://namemc.com/profile/$/dce40453\n\n" + "^(?![0-9a-zA-Z\\_]{1,16}.)*$\n\n\n\n" + "[Admin] Hink\n" + " [Mod] Hink\n" + "asd [] asd\n" + "[] Nigger\n" + "[[ ]]\n" + "][\n\n" + ".*?[\\[](.+)?[\\]].*\n\n\n\n" + "^([^a-zA-Z0-9]*|.*[^a-zA-Z0-9]*)?[\\h\\H\\Ĥ\\ĥ\\Ħ\\ħ][^a-zA-Z0-9]*[\\i\\I\\!\\|\\Ì\\ì\\Í\\í\\Î\\î\\Ï\\ï\\!\\|][^a-zA-Z0-9]*[\\n\\N\\Ń\\ń\\Ņ\\ņ\\Ň\\ň\\ʼn\\Ŋ\\ŋ][^a-zA-Z0-9]*[\\k\\K\\Ķ\\ķ\\ĸ].*?$\n" + "hink\n" + "Hink\n" + "HiNk\n" + "hnk\n" + "think\n" + " hink\n" + "-hink_\n" + "h-i-n-k\n" + "h i n k\n" + "kys hink\n" + "idk hink what's up?\n" + "stop being a nif\n" + "t hink\n" + "2 2 hi___nk 22\n\n\n\n\n\n" + "^([^a-zA-Z0-9]*|(.*[^a-zA-Z0-9]+))?[hH\\Ĥ\\ĥ\\Ħ\\ħ][^a-zA-Z0-9]*[iI!|\\Ì\\ì\\Í\\í\\î\\Ï\\ï][^a-zA-Z0-9]*[nN\\Ń\\ń\\Ņ\\ņ\\Ň\\ň\\ʼn\\Ŋ\\ŋ][^a-zA-Z0-9]*[kK\\Ķ\\ķ\\ĸ].*$\n" + "Hink\n" + "hink\n" + "think\n" + "hink is cunt\n" + "lick my cunt hink\n" + "h - ink\n" + " h ---inK+_\n" + "ĤÏNķ\n" + "think\n" + "sticky hinky\n\n" + "^[\\h\\H\\Ĥ\\ĥ\\Ħ\\ħ][\\i\\I\\!\\|\\Ì\\ì\\Í\\í\\Î\\î\\Ï\\ï][\\n\\N\\Ń\\ń\\Ņ\\ņ\\Ň\\ň\\ʼn\\Ŋ\\ŋ][\\k\\K\\Ķ\\ķ\\ĸ]$\n\n\n" + "^.*[\\⁢\\ㅤ\\ﾠ\\ᅠ\\ᅟ].*$\n\n" + "^.*[\\u2062\\u3164\\uFFA0\\u1160\\u115F].*$\n" + "http://www.fileformat.info/info/unicode/char/2062/index.htm: \"⁢\"\n" + "http://www.fileformat.info/info/unicode/char/3164/index.htm: \"ㅤ\"\n" + "http://www.fileformat.info/info/unicode/char/ffa0/index.htm: \"ﾠ\"\n" + "http://www.fileformat.info/info/unicode/char/1160/index.htm: \"ᅠ\"\n" + "http://www.fileformat.info/info/unicode/char/115f/index.htm: \"ᅟ\"\n\n\n" + "^([^a-zA-Z0-9]*|(.*[^a-zA-Z0-9]+))?[hH][^a-zA-Z0-9]*[iI!][^a-zA-Z0-9]*[nN][^a-zA-Z0-9]*[kK].*$\n\n\n"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html