Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • 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
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

Substitution
Processing...

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 = "(?:[\\s\\-\\_\\—\\–\\~\\(\\[\\{\\\"\\'\\‹\\«\\“\\‘\\¡\\¿\\/]?(AySA)[\\.\\,\\:\\;\\-\\_\\—\\–\\~\\s\\)\\]\\}\\\"\\'\\›\\»\\”\\’\\!\\?\\*\\/]?)"; final String string = "[START]\n" + "AySA \n" + "AySA,\n" + "AySA\n" + "AySA\n" + " AySA\n" + "-AySA\n" + "_AySA\n" + "—AySA\n" + "–AySA\n" + "~AySA\n" + "(AySA\n" + "[AySA\n" + "{AySA\n" + "‹AySA\n" + "«AySA\n" + "“AySA\n" + "‘AySA\n" + "¿AySA\n" + "¡AySA\n" + "/AySA\n\n\n" + "[END]\n" + "AySA\n" + "AySA\n" + "AySA,\n" + "AySA.\n" + "AySA \n" + "AySA-\n" + "AySA_\n" + "AySA—\n" + "AySA–\n" + "AySA~\n" + "AySA)\n" + "AySA]\n" + "AySA}\n" + "AySA›\n" + "AySA»\n" + "AySA”\n" + "AySA’\n" + "AySA?\n" + "AySA!\n" + "AySA/\n\n\n" + "[BOTH]\n" + "(AySA-\n" + "Esta nueva empresa, AySA. encargada\n\n" + "[INVALID]\n" + "AYSA\n" + "aysa\n" + "AySa\n" + "aYsA"; final String subst = "<abbr title=\"Agua y Saneamiento Argentina\">\\1</abbr>\\n"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + 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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html