Regular Expressions 101

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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

const regex = /(?<monthname>^\w{3})\s(?<daynumber>\d{2})\s(?<logtime>.{8})\s*(?<entrytype>((NMAS-[0-9].....).|log4cxx:|Started|DHLog:|NetIQ eDirectory CEF|SASL|NetIQ PKI|LDAP Agent|SPM DClient|NMAS|Mandatory Access Control|NDS iMonitor|Information:|Graded Authentication Management)(?<value>.*))/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?<monthname>^\\w{3})\\s(?<daynumber>\\d{2})\\s(?<logtime>.{8})\\s*(?<entrytype>((NMAS-[0-9].....).|log4cxx:|Started|DHLog:|NetIQ eDirectory CEF|SASL|NetIQ PKI|LDAP Agent|SPM DClient|NMAS|Mandatory Access Control|NDS iMonitor|Information:|Graded Authentication Management)(?<value>.*))', 'gm') const str = `Feb 11 07:13:51 log4cxx: IO Exception : status code = 104 Feb 11 07:13:51 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 07:13:51 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 07:13:43 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=sadec86.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 07:10:03 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 07:09:37 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=jstamler.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 07:09:20 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=71877bjm2.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 07:08:47 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=dlroberts330.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 07:07:23 log4cxx: IO Exception : status code = 104 Feb 11 07:07:23 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 06:46:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 06:46:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 06:39:40 log4cxx: IO Exception : status code = 104 Feb 11 06:39:40 log4cxx: IO Exception : status code = 104 Feb 11 06:39:40 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 06:39:40 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 06:38:02 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=sgciamrt.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 06:32:21 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=narrong12@utexas\\.edu.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 06:30:03 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 06:12:37 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 06:12:37 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 06:08:07 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=firedog3.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 06:06:41 log4cxx: IO Exception : status code = 104 Feb 11 06:06:41 log4cxx: IO Exception : status code = 104 Feb 11 06:06:41 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 06:06:41 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 05:56:07 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=marvels002@nwie\\.com.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 05:50:02 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 05:49:35 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 05:45:02 log4cxx: IO Exception : status code = 104 Feb 11 05:45:02 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 05:39:43 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 05:39:43 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 05:35:17 log4cxx: IO Exception : status code = 104 Feb 11 05:35:17 log4cxx: IO Exception : status code = 104 Feb 11 05:35:17 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 05:35:17 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 05:10:02 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 05:09:05 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=support.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 05:08:39 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=MFA-RegL_pwR9m7CFCCW.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 04:55:30 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=MFA-RegL_pwR9m7CFCCW.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 04:51:50 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=mattrechs6.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 04:51:44 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=jeanty12@gmail\\.com.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 04:49:22 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=1587yunyulu.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 04:48:35 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=marvels002@nwie\\.com.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 04:45:13 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=admin1.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 04:35:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 04:30:03 log4cxx: IO Exception : status code = 104 Feb 11 04:30:03 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 04:25:05 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 04:17:46 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=sgciamrt.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 04:09:36 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ADMIN.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 03:45:03 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ihrligt.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 03:41:23 NMAS-9.2.2.0 User account locked due to intruder detection. User: uniqueID=MFA-RegL_pwR9m7CFCCW.OU=BusPartners.OU=b2b.OU=ext.OU=people.dc=nationwidedir.dc=extpilot Feb 11 03:28:53 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=lasmileysm.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 03:13:47 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=cardo04.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 03:10:08 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=ADMIN.OU=Int.OU=people.dc=nationwidedir.dc=net Feb 11 03:00:01 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=Medinav.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 02:50:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 02:45:02 log4cxx: IO Exception : status code = 104 Feb 11 02:45:02 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 02:36:09 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=everstacie123.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 02:25:17 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=DYGGER81.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 02:25:03 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 02:20:02 log4cxx: IO Exception : status code = 104 Feb 11 02:20:02 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 02:17:41 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 02:15:52 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 02:14:40 log4cxx: IO Exception : status code = 104 Feb 11 02:14:40 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 02:12:30 log4cxx: IO Exception : status code = 104 Feb 11 02:12:30 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:59:30 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:58:57 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:58:42 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:56:42 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=dwmillican.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 01:55:02 log4cxx: IO Exception : status code = 104 Feb 11 01:55:02 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:55:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:53:50 log4cxx: IO Exception : status code = 104 Feb 11 01:53:50 log4cxx: IO Exception : status code = 104 Feb 11 01:53:50 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:53:50 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:50:03 log4cxx: IO Exception : status code = 104 Feb 11 01:50:03 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:42:12 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=kjason5557@gmail\\.com.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 01:41:29 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:41:29 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:33:50 log4cxx: IO Exception : status code = 104 Feb 11 01:33:50 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:32:51 log4cxx: IO Exception : status code = 104 Feb 11 01:32:51 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:28:54 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=nikolaparan.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 01:23:22 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:23:17 NMAS-9.1.4.0 User account locked due to intruder detection. User: uniqueID=bjnoel@live\\.com.OU=MyNW.OU=B2C.OU=Ext.OU=People.dc=nationwidedir.dc=com Feb 11 01:20:03 log4cxx: IO Exception : status code = 104 Feb 11 01:20:03 log4cxx: Detected problem with TCP connection to infra-logging.nwie.net. All logging will FAIL. Feb 11 01:19:01 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:16:28 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net Feb 11 01:15:02 log4cxx: Connection to TCP host established successfully: infra-logging.nwie.net `; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions