Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • 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]
  • 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 re regex = re.compile(r"(\"|\s)(?<key>(CN|C|O|OU|S))=(?<value>(\S+|\s+|\w+|\W+))") test_str = ("ssl_issuer=\"CN=DigiCert SHA2 High Assurance Server CA C=US O=DigiCert Inc OU=www.digicert.com\" ssl_hash=\"f41565b049f039e765a0f8be8271a4b4817b7378\" ssl_subject=\"CN=syndication.twitter.com C=US S=California O=Twitter, Inc. OU=Twitter Security\" ssl_start_time=\"Wed Jun 29 00:00:00 2016 UTC\" ssl_end_time=\"Mon Sep 16 12:00:00 2019 UTC\" ssl_type=\"X.509 Certificate\" ssl_extended_key_usage=\"Server Authentication, Client Authentication\" ssl_key_length=\"2048 bits\" ssl_key_usage=\"Digital Signature, Key Encipherment\"\n" " \n" " ssl_subject=\"CN=*.eu-west-1.webrootcloudav.com\" ssl_start_time=\"Tue Aug 22 00:00:00 2017 UTC\" ssl_end_time=\"Sat Sep 22 12:00:00 2018 UTC\" ssl_type=\"X.509 Certificate\" ssl_extended_key_usage=\"\" ssl_key_length=\"2048 bits\" ssl_key_usage=\"Digital Signature, Non-Repudiation, Key Encipherment\"\n" " \n" " ssl_subject=\"CN=*.us.static.hrsmart.com C=US S=Virginia O=Deltek, Inc. OU=Security Services\" ssl_start_time=\"Thu Jan 11 00:00:00 2018 UTC\" ssl_end_time=\"Sun Mar 31 12:00:00 2019 UTC\" ssl_type=\"X.509 Certificate\" ssl_extended_key_usage=\"Server Authentication, Client Authentication\" ssl_key_length=\"2048 bits\" ssl_key_usage=\"Digital Signature, Key Encipherment\"\n" " \n" " ssl_subject=\"CN=*.googleapis.com C=US S=California O=Google Inc\" ssl_start_time=\"Tue Mar 13 18:57:10 2018 UTC\" ssl_end_time=\"Tue Jun 5 18:17:00 2018 UTC\" ssl_type=\"X.509 Certificate\" ssl_extended_key_usage=\"Server Authentication, Client Authentication\" ssl_key_length=\"0 bits\" ssl_key_usage=\"Digital Signature, Certificate Signing, CRL Signing\"\n" " \n" " ssl_subject=\"CN=subscription.rhsm.redhat.com C=US S=North Carolina O=Red Hat, Inc. OU=Red Hat Network\" ssl_start_time=\"Thu May 18 16:30:24 2017 UTC\" ssl_end_time=\"Sat May 18 16:30:24 2019 UTC\" ssl_type=\"X.509 Certificate\" ssl_extended_key_usage=\"Server Authentication\" ssl_key_length=\"4096 bits\" ssl_key_usage=\"\"") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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 Python, please visit: https://docs.python.org/3/library/re.html