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

/
/
ims

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 = "((<.*?):Envelope.*Envelope>)"; final String string = "31-10-2014 00:12:12,075 [INFO] REQUEST:\n" + "<?xml version=\"1.0\" encoding=\"utf-8\"?><SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:ns2=\"urn:ZEKTransactionService\" xmlns:ns1=\"http://zeksoap.xml.prechku.sys:7001/dvzek/services/ZEKTransactionService\" xmlns:ns3=\"http://impl.zkb.appl.ch\"><SOAP-ENV:Body SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\"><ns1:closeLeasingMietvertrag><identityDescriptor xsi:type=\"ns2:IdentityDescriptor\"><clientUserId xsi:type=\"xsd:string\">EXPLOIT</clientUserId><name xsi:type=\"xsd:string\">RCISoapUser</name><password xsi:type=\"xsd:string\">ziucx+okpb</password></identityDescriptor><requestEntities xsi:type=\"SOAP-ENC:Array\" SOAP-ENC:arrayType=\"ns2:RequestEntity[1]\"><item xsi:type=\"ns2:RequestEntity\"><addressDescription xsi:type=\"ns2:AddressDescription\"><birthdate xsi:type=\"xsd:string\">1961-03-13</birthdate><city xsi:type=\"xsd:string\">Balsthal</city><country xsi:type=\"xsd:string\">CHE</country><datumWohnhaftSeit xsi:type=\"xsd:string\">1990-04-01</datumWohnhaftSeit><firstname xsi:type=\"xsd:string\">Mina</firstname><housenumber xsi:type=\"xsd:string\">.</housenumber><legalForm xsi:type=\"xsd:int\">1</legalForm><name xsi:type=\"xsd:string\">Bilalli</name><nationality xsi:type=\"xsd:string\">XKO</nationality><sex xsi:type=\"xsd:int\">1</sex><street xsi:type=\"xsd:string\">Guntenfluhweg 14</street><zip xsi:type=\"xsd:string\">4710</zip><zivilstandscode xsi:type=\"xsd:int\">1</zivilstandscode></addressDescription><debtorRole xsi:type=\"xsd:int\">0</debtorRole><forceNewAddress xsi:type=\"xsd:int\">0</forceNewAddress><previousReturnCode xsi:type=\"xsd:int\">0</previousReturnCode><refno xsi:type=\"xsd:int\">1</refno></item></requestEntities><leasingMietvertrag xsi:type=\"ns2:LeasingMietvertragDescription\"><anzahlMonatlicheRaten xsi:type=\"xsd:int\">0</anzahlMonatlicheRaten><anzahlung xsi:type=\"xsd:int\">0</anzahlung><bonitaetsCodeIKO xsi:type=\"xsd:int\">4</bonitaetsCodeIKO><bonitaetsCodeZEK xsi:type=\"xsd:int\">5</bonitaetsCodeZEK><datumBonitaetIKO xsi:type=\"xsd:string\">2014-10-30</datumBonitaetIKO><datumBonitaetZEK xsi:type=\"xsd:string\">2014-10-30</datumBonitaetZEK><debtorRole xsi:type=\"xsd:int\">0</debtorRole><ersteGrosseRate xsi:type=\"xsd:int\">0</ersteGrosseRate><filiale xsi:type=\"xsd:int\">0</filiale><grosseSchlussrate xsi:type=\"xsd:int\">0</grosseSchlussrate><herkunft xsi:type=\"xsd:int\">0</herkunft><kennzeichen xsi:type=\"xsd:int\">0</kennzeichen><kreditBetrag xsi:type=\"xsd:float\">0</kreditBetrag><kreditVertragID xsi:type=\"xsd:string\">142051011553</kreditVertragID><monatsrate xsi:type=\"xsd:float\">0</monatsrate><restwert xsi:type=\"xsd:int\">0</restwert><sicherstellungsCode xsi:type=\"xsd:int\">0</sicherstellungsCode><theoRestSaldo xsi:type=\"xsd:float\">0</theoRestSaldo><vertragsStatus xsi:type=\"xsd:int\">0</vertragsStatus></leasingMietvertrag></ns1:closeLeasingMietvertrag></SOAP-ENV:Body></SOAP-ENV:Envelope>\n" + " | Thread:http-7001-Processor23"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL); final Matcher matcher = pattern.matcher(string); if (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