Regular Expressions 101

Save & Share

  • Regex Version: ver. 3
  • 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

/
/
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 = "ContactMessageTransport[\\s\\S]*?Started(?:[^\\r\\n]*[\\r\\n]){3}"; final String string = " <getAllMessageQueueInfoResponse xmlns=\"http:abcd.com/MessageQueueAnalyticsAPI\">\n" + " <return>\n" + " <Entry xmlns:pogo=\"http://example.com/com/integration/services/messagequeueanalyticsservice\">\n" + " <pogo:AckCount>0</pogo:AckCount>\n" + " <pogo:DestinationID>0</pogo:DestinationID>\n" + " <pogo:ErrorCount>25</pogo:ErrorCount>\n" + " <pogo:ID>67</pogo:ID>\n" + " <pogo:Latest>2017-11-28T00:00:00-05:00</pogo:Latest>\n" + " <pogo:Name>ContactMessageTransport</pogo:Name>\n" + " <pogo:NotAckCount>0</pogo:NotAckCount>\n" + " <pogo:Oldest>2017-11-28T00:00:00-05:00</pogo:Oldest>\n" + " <pogo:RetryableErrorCount>31</pogo:RetryableErrorCount>\n" + " <pogo:SkippedCount>0</pogo:SkippedCount>\n" + " <pogo:Status>Started</pogo:Status>\n" + " <pogo:UnsentCount>212</pogo:UnsentCount>\n" + " </Entry>\n" + " <Entry xmlns:pogo=\"http://example.com/com/integration/services/messagequeueanalyticsservice\">\n" + " <pogo:AckCount>0</pogo:AckCount>\n" + " <pogo:DestinationID>0</pogo:DestinationID>\n" + " <pogo:ErrorCount>0</pogo:ErrorCount>\n" + " <pogo:ID>65</pogo:ID>\n" + " <pogo:Latest>2018-03-17T00:00:00-04:00</pogo:Latest>\n" + " <pogo:Name>Email</pogo:Name>\n" + " <pogo:NotAckCount>0</pogo:NotAckCount>\n" + " <pogo:Oldest>2018-03-17T00:00:00-04:00</pogo:Oldest>\n" + " <pogo:RetryableErrorCount>4</pogo:RetryableErrorCount>\n" + " <pogo:SkippedCount>0</pogo:SkippedCount>\n" + " <pogo:Status>Started</pogo:Status>\n" + " <pogo:UnsentCount>0</pogo:UnsentCount>\n" + " </Entry>"; 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