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
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

const regex = /(?<date>\d[\d:.]+)\W+(?<InPorts>\d+):\s*(?<OutPort>\d+)\W+G-MST:\s*(?<GMST>\w+)\W+guid=(?<Guid>[^"]+)"\W+(?<SourceIP>\d{1,3}(?:\.\d{1,3}){3})\W+(?<targetIP>\d{1,3}(?:\.\d{1,3}){3})\W+(?<SourceSpeed>\d+)\W+(?<TargetSpeed>\d+)\D+(?<AudioType>\d+)\D+(?<rsn>\d+)\W+(?<utc>\d[\d.:]*)\D+(?<pl>\d+)\D+(?<s>\d+)\D+(?<r>\d+)\D+(?<l>\d+)\D+(?<j>\d+)\D+(?<u>\d+)\D+(?<o>\d+)\D+(?<flags>0x\d+).*?:(?<sip>[^"]*)"\D+(?<vpn>\d+)/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?<date>\\d[\\d:.]+)\\W+(?<InPorts>\\d+):\\s*(?<OutPort>\\d+)\\W+G-MST:\\s*(?<GMST>\\w+)\\W+guid=(?<Guid>[^"]+)"\\W+(?<SourceIP>\\d{1,3}(?:\\.\\d{1,3}){3})\\W+(?<targetIP>\\d{1,3}(?:\\.\\d{1,3}){3})\\W+(?<SourceSpeed>\\d+)\\W+(?<TargetSpeed>\\d+)\\D+(?<AudioType>\\d+)\\D+(?<rsn>\\d+)\\W+(?<utc>\\d[\\d.:]*)\\D+(?<pl>\\d+)\\D+(?<s>\\d+)\\D+(?<r>\\d+)\\D+(?<l>\\d+)\\D+(?<j>\\d+)\\D+(?<u>\\d+)\\D+(?<o>\\d+)\\D+(?<flags>0x\\d+).*?:(?<sip>[^"]*)"\\D+(?<vpn>\\d+)', 'gm') const str = `08:07:46.914 ( 1708: 8624) G-MST: 400000EF " guid=00040000-73b2-5c7f-2295-00104941e7b0" ("10.10.60.3","10.10.29.251"),(10292, 59046),2(ULaw),rsn:1,12:05:15.623 (UTC),pl:20,(s:7525, r:7557, l:0),(j:0,u:27037,o:0) flgs:0x00000000 "sip:TGrp_5,p111@10.10.60.3:5441",vpn:0`; // 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