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

/
/
gm

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 = "([ - ]| |[ -~]|[ -¬]|[®-ž]|[Ƈ-ƈ]|Ə|Ɨ|[Ơ-ơ]|[Ư-ư]|Ʒ|[Ǎ-ǜ]|[Ǟ-ǟ]|[Ǣ-ǰ]|[Ǵ-ǵ]|[Ǹ-ǿ]|[Ȓ-ȓ]|[Ș-ț]|[Ȟ-ȟ]|[ȧ-ȳ]|ə|ɨ|ʒ|[ʹ-ʺ]|[ʾ-ʿ]|ˈ|ˌ|[Ḃ-ḃ]|[Ḇ-ḇ]|[Ḋ-ḑ]|[Ḝ-ḫ]|[ḯ-ḷ]|[Ḻ-ḻ]|[Ṁ-ṉ]|[Ṓ-ṛ]|[Ṟ-ṣ]|[Ṫ-ṯ]|[Ẁ-ẇ]|[Ẍ-ẗ]|ẞ|[Ạ-ỹ]|’|‡|€|A̋|C(̀|̄|̆|̈|̕|̣|̦|̨̆)|D̂|F(̀|̄)|G̀|H(̄|̦|̱)|J(́|̌)|K(̀|̂|̄|̇|̕|̛|̦|͟H|͟h)|L(̂|̥|̥̄|̦)|M(̀|̂|̆|̐)|N(̂|̄|̆|̦)|P(̀|̄|̕|̣)|R(̆|̥|̥̄)|S(̀|̄|̛̄|̱)|T(̀|̄|̈|̕|̛)|U̇|Z(̀|̄|̆|̈|̧)|a̋|c(̀|̄|̆|̈|̕|̣|̦|̨̆)|d̂|f(̀|̄)|g̀|h(̄|̦)|j́|k(̀|̂|̄|̇|̕|̛|̦|͟h)|l(̂|̥|̥̄|̦)|m(̀|̂|̆|̐)|n(̂|̄|̆|̦)|p(̀|̄|̕|̣)|r(̆|̥|̥̄)|s(̀|̄|̛̄|̱)|t(̀|̄|̕|̛)|u̇|z(̀|̄|̆|̈|̧)|Ç̆|Û̄|ç̆|û̄|ÿ́|Č(̕|̣)|č(̕|̣)|Ī́|ī́|Ž(̦|̧)|ž(̦|̧)|Ḳ̄|ḳ̄|Ṣ̄|ṣ̄|Ṭ̄|ṭ̄|Ạ̈|ạ̈|Ọ̈|ọ̈|Ụ(̄|̈)|ụ(̄|̈))*"; final String string = "Ein Text nach entsprechend dem din-91379.datatypeC!"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); 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