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

/
/
gm

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"^(\S+|\S+\s+\d+\s+\S+) [^\s\.]+ .*warn .* Failed to fetch cPStore[\s\S]*?(?=\n.*?\[)" test_str = ("[2023-08-03 06:15:03 -0400] info [autorepair] Successfully verified signature for cpanel (key types: release).\n" "[2023-08-03 06:15:04 -0400] info [autorepair] Successfully verified signature for cpanel (key types: release).\n" "[2023-08-03 06:45:04 -0400] warn [xml-api] Failed to fetch cPStore products list: Cpanel::Exception::Market::Disabled/(XID qxedn2) “cPanel Store” indicated that the Market has been disabled by the license holder.\n" " at /usr/local/cpanel/Cpanel/Exception/External.pm line 106.\n" " Cpanel::Exception::External::create(\"Market::Disabled\", HASH(0x4cc2b50)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 94\n" " Cpanel::Market::Provider::cPStore::ProductsCache::__ANON__(Cpanel::Exception::cPStoreError=HASH(0x53ee560)) called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 121\n" " Try::Tiny::try(CODE(0x4dde068), Try::Tiny::Catch=REF(0x4c71d90)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 96\n" " Cpanel::Market::Provider::cPStore::ProductsCache::_LOAD_FRESH(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/CacheFile.pm line 239\n" " Cpanel::CacheFile::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 139\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load_with_short_name(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 104\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 180\n" " Cpanel::Market::Provider::cPStore::_get_products_list_for_validation() called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 167\n" " Cpanel::Market::Provider::cPStore::get_products_list() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 119\n" " Cpanel::Config::ConfigObj::Driver::Market::META::__ANON__() called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 100\n" " eval {...} called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 91\n" " Try::Tiny::try(CODE(0x4dcaf10), Try::Tiny::Catch=REF(0x48fd770)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 124\n" " Cpanel::Config::ConfigObj::Driver::Market::META::can_be_enabled() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 148\n" " Cpanel::Config::ConfigObj::Driver::Market::META::auto_enable(\"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 106\n" " Cpanel::Config::ConfigObj::_unload_if_auto_enabled(\"Cpanel::Config::ConfigObj::Driver::Market\", \"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 160\n" " Cpanel::Config::ConfigObj::get_available_drivers(undef, 0, 0) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 563\n" " Cpanel::Config::ConfigObj::_get_drivers(Cpanel::Config::ConfigObj=HASH(0x486f4b0)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 707\n" " Cpanel::Config::ConfigObj::call_all(Cpanel::Config::ConfigObj=HASH(0x486f4b0), \"acl_desc\") called at /usr/local/cpanel/Whostmgr/ACLS.pm line 112\n" " Whostmgr::ACLS::_dynamic_acl_items() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 133\n" " Whostmgr::ACLS::_get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 175\n" " Whostmgr::ACLS::_dynamic_acl_update() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 117\n" " Whostmgr::ACLS::get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 97\n" " Whostmgr::ACLS::get_filtered_reseller_privs() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 68\n" " Whostmgr::ACLS::_acls() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 53\n" " Whostmgr::ACLS::init_acls() called at whostmgr/bin/xml-api.pl line 5024\n" " whostmgr::bin::xml_api::script(CODE(0x472a388), \"-json\", \"./listaccts\") called at whostmgr/bin/xml-api.pl line 5015\n\n" "[2023-08-03 07:05:07 -0400] info [xml-api] Permission denied: You do not have the required privileges to run “listresellers”. [listresellers] version [1].\n" "[2023-08-03 07:45:07 -0400] warn [xml-api] Failed to fetch cPStore products list: Cpanel::Exception::Market::Disabled/(XID uym54m) “cPanel Store” indicated that the Market has been disabled by the license holder.\n" " at /usr/local/cpanel/Cpanel/Exception/External.pm line 106.\n" " Cpanel::Exception::External::create(\"Market::Disabled\", HASH(0x4a37628)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 94\n" " Cpanel::Market::Provider::cPStore::ProductsCache::__ANON__(Cpanel::Exception::cPStoreError=HASH(0x51ff6c0)) called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 121\n" " Try::Tiny::try(CODE(0x4beef68), Try::Tiny::Catch=REF(0x4a82d80)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 96\n" " Cpanel::Market::Provider::cPStore::ProductsCache::_LOAD_FRESH(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/CacheFile.pm line 239\n" " Cpanel::CacheFile::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 139\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load_with_short_name(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 104\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 180\n" " Cpanel::Market::Provider::cPStore::_get_products_list_for_validation() called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 167\n" " Cpanel::Market::Provider::cPStore::get_products_list() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 119\n" " Cpanel::Config::ConfigObj::Driver::Market::META::__ANON__() called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 100\n" " eval {...} called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 91\n" " Try::Tiny::try(CODE(0x4bdbf30), Try::Tiny::Catch=REF(0x470e6c0)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 124\n" " Cpanel::Config::ConfigObj::Driver::Market::META::can_be_enabled() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 148\n" " Cpanel::Config::ConfigObj::Driver::Market::META::auto_enable(\"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 106\n" " Cpanel::Config::ConfigObj::_unload_if_auto_enabled(\"Cpanel::Config::ConfigObj::Driver::Market\", \"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 160\n" " Cpanel::Config::ConfigObj::get_available_drivers(undef, 0, 0) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 563\n" " Cpanel::Config::ConfigObj::_get_drivers(Cpanel::Config::ConfigObj=HASH(0x45c6558)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 707\n" " Cpanel::Config::ConfigObj::call_all(Cpanel::Config::ConfigObj=HASH(0x45c6558), \"acl_desc\") called at /usr/local/cpanel/Whostmgr/ACLS.pm line 112\n" " Whostmgr::ACLS::_dynamic_acl_items() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 133\n" " Whostmgr::ACLS::_get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 175\n" " Whostmgr::ACLS::_dynamic_acl_update() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 117\n" " Whostmgr::ACLS::get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 97\n" " Whostmgr::ACLS::get_filtered_reseller_privs() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 68\n" " Whostmgr::ACLS::_acls() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 53\n" " Whostmgr::ACLS::init_acls() called at whostmgr/bin/xml-api.pl line 5024\n" " whostmgr::bin::xml_api::script(CODE(0x453b568), \"-json\", \"./listaccts\") called at whostmgr/bin/xml-api.pl line 5015\n\n" "[2023-08-03 08:45:05 -0400] warn [xml-api] Failed to fetch cPStore products list: Cpanel::Exception::Market::Disabled/(XID b69t9c) “cPanel Store” indicated that the Market has been disabled by the license holder.\n" " at /usr/local/cpanel/Cpanel/Exception/External.pm line 106.\n" " Cpanel::Exception::External::create(\"Market::Disabled\", HASH(0x4286c10)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 94\n" " Cpanel::Market::Provider::cPStore::ProductsCache::__ANON__(Cpanel::Exception::cPStoreError=HASH(0x49b2678)) called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 121\n" " Try::Tiny::try(CODE(0x43a2078), Try::Tiny::Catch=REF(0x4235dd0)) called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 96\n" " Cpanel::Market::Provider::cPStore::ProductsCache::_LOAD_FRESH(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/CacheFile.pm line 239\n" " Cpanel::CacheFile::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 139\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load_with_short_name(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore/ProductsCache.pm line 104\n" " Cpanel::Market::Provider::cPStore::ProductsCache::load(\"Cpanel::Market::Provider::cPStore::ProductsCache\") called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 180\n" " Cpanel::Market::Provider::cPStore::_get_products_list_for_validation() called at /usr/local/cpanel/Cpanel/Market/Provider/cPStore.pm line 167\n" " Cpanel::Market::Provider::cPStore::get_products_list() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 119\n" " Cpanel::Config::ConfigObj::Driver::Market::META::__ANON__() called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 100\n" " eval {...} called at /usr/local/cpanel/3rdparty/perl/536/cpanel-lib/Try/Tiny.pm line 91\n" " Try::Tiny::try(CODE(0x438eaf8), Try::Tiny::Catch=REF(0x3ec1690)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 124\n" " Cpanel::Config::ConfigObj::Driver::Market::META::can_be_enabled() called at /usr/local/cpanel/Cpanel/Config/ConfigObj/Driver/Market/META.pm line 148\n" " Cpanel::Config::ConfigObj::Driver::Market::META::auto_enable(\"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 106\n" " Cpanel::Config::ConfigObj::_unload_if_auto_enabled(\"Cpanel::Config::ConfigObj::Driver::Market\", \"Cpanel::Config::ConfigObj::Driver::Market::META\") called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 160\n" " Cpanel::Config::ConfigObj::get_available_drivers(undef, 0, 0) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 563\n" " Cpanel::Config::ConfigObj::_get_drivers(Cpanel::Config::ConfigObj=HASH(0x3d78750)) called at /usr/local/cpanel/Cpanel/Config/ConfigObj.pm line 707\n" " Cpanel::Config::ConfigObj::call_all(Cpanel::Config::ConfigObj=HASH(0x3d78750), \"acl_desc\") called at /usr/local/cpanel/Whostmgr/ACLS.pm line 112\n" " Whostmgr::ACLS::_dynamic_acl_items() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 133\n" " Whostmgr::ACLS::_get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 175\n" " Whostmgr::ACLS::_dynamic_acl_update() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 117\n" " Whostmgr::ACLS::get_dynamic_acl_lists() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 97\n" " Whostmgr::ACLS::get_filtered_reseller_privs() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 68\n" " Whostmgr::ACLS::_acls() called at /usr/local/cpanel/Whostmgr/ACLS.pm line 53\n" " Whostmgr::ACLS::init_acls() called at whostmgr/bin/xml-api.pl line 5024\n" " whostmgr::bin::xml_api::script(CODE(0x3ceddb8), \"-json\", \"./listaccts\") called at whostmgr/bin/xml-api.pl line 5015\n\n" "[2023-08-03 09:09:50 -0400] info [whostmgrd] Successfully verified signature for cpanel (key types: release).\n") matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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