Regular Expressions 101

Save & Manage Regex

  • Current Version: 3
  • 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
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]
  • Character class intersection
    [\w&&[^\d]]
  • 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

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 = "[\\w\\d]*?\":\\{\"[\\w]*?\":?\\{\"[\\w]*?\":[0-9\\d]*,\"[\\w]*?\":[0-9\\d]*,\"[\\w]*?\":[0-9\\d]*\\},\"[\\w]*\\\":\\{\"[\\w]*\\\":[0-9\\d]*,\"[\\w]*\\\":[0-9\\d]*,\"[\\w]*\\\":[0-9\\d]*,\"[\\w]*\\\":[0-9\\d]*\\}\\}"; final String string = "2020-11-04 17:14:29,367 : [INFO ] GW-26-C-1 [c.n.s.s.MyKafkaConsumer:19] [GW-26-C-1] : ConsumerRecord(topic = CBBL_GP, partition = 2, leaderEpoch = 20, offset = 4386, CreateTime = 1604488454631, serialized key size = -1, serialized value size = 1139, headers = RecordHeaders(headers = [], isReadOnly = false), key = null, value = {\"clientUserName\":\"usersms@communitybank.com.bd\",\"test\":false,\"clientCbsSmsId\":\"20201104_051123_S179371_22\",\"txnDateTime\":{\"date\":{\"year\":2020,\"month\":11,\"day\":4},\"time\":{\"hour\":17,\"minute\":7,\"second\":22,\"nano\":0}},\"senderId\":\"COMMUNITY_BANK\",\"acctId\":\"0010112519201\",\"creditDebit\":\"C\",\"amount\":30886,\"cellPhone\":\"8801735654457\",\"sendToNumber\":\"8801735654457\",\"message\":\"Community Bank - Your account 001*******201 has been credited with BDT 30886 (SALARY OCTOBER-2020) on 04-Nov-20 05:14:23 PM BST. Your Current Balance is BDT 32057.38. Thank you.\",\"clientRequestDateTime\":{\"date\":{\"year\":2020,\"month\":11,\"day\":4},\"time\":{\"hour\":17,\"minute\":14,\"second\":14,\"nano\":631000000}},\"expiryDateTime\":{\"date\":{\"year\":2020,\"month\":11,\"day\":5},\"time\":{\"hour\":5,\"minute\":14,\"second\":23,\"nano\":0}},\"retryCount\":1,\"valid\":true,\"validateCell\":false,\"defaultSmsLength\":160,\"exceedDefaultSmsLength\":false,\"telcoLocalPrefix\":\"017\",\"telcoName\":\"GP\",\"status\":\"GW_PENDING\",\"isDirty\":false,\"customerNo\":\"0112519\",\"smsFormat\":\"SMS_FORMAT_DEFAULT\",\"unicode\":0,\"includeResend\":false,\"messagetype\":0,\"smsResultList\":[],\"version\":0,\"active\":1,\"tzName\":\"Asia/Dhaka\"})"; 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