Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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"
"
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 = "[^\\d]((\\+49|0049|0)1[567]\\d{1,2}([ \\-/]*\\d){7})(?!\\d)"; final String string = "################################### This is allowed ##########################\n" + "+49 15207930698\n" + "+49 15207955279\n" + "+49 915175461907\n\n\n" + "+4915207829969\n" + "+4915368831169\n" + "+491771399487\n" + "+4917697300278\n" + "+4915902955865\n" + "+491771789427\n" + "+4917697400179\n" + "+4915903904567\n" + "+4915902944599\n" + "+491739341284\n" + "+4915902944599\n" + "+4915903904567\n" + "The number +491739341284 with some text\n\n" + "Germany  +4915255687865Total SMS: 6758\n" + "This number 015731294508 we need!\n" + "015731294508\n" + "015735995842\n\n" + "015168433343\n" + "Here:015731294508Hallo\n" + "Here:015731294508\n" + "<td>01573 / 1294-508</tr>\n" + "<td>015731294508</tr>\n" + "Eine Nummer: 01515 84 333 78\n" + "Wichtige Nummer:015731294508.\n" + "Noch eine Nummer-015731294508,\n" + "015731294508Hier\n\n" + "<td>01573 1294 508</tr>\n\n\n" + "################################### This is NOT allowed ##########################\n" + "012345678901234\n" + "123w345345345345\n" + "0123456789101191919\n" + "+4915902\n" + "+491590123\n" + "+4915903567\n" + "+49177178796\n" + "+49159039012341\n" + "+491590345985412\n\n" + "Invalid number +491590345985412 within text\n\n" + "+12127319863\n" + "+13322014056\n" + "+12126712234\n" + "+427532697710\n" + "+417868150810\n" + "+287533002875\n\n" + "+49 1739341284\n" + "(+49) 1739341284\n" + "+49 17 39 34 12 84\n" + "+49 (1739) 34 12 84\n" + "+(49) (1739) 34 12 84\n" + "+49 (1739) 34-12-84\n\n"; 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