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 = /^(\S+)\h+(\S+)\h+(\w+(?:\h\w+)*(?:\h*\([^)]+\)(?:\h\w+)?)?)(?:\h{2,}(\S+))?$/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('^(\\S+)\\h+(\\S+)\\h+(\\w+(?:\\h\\w+)*(?:\\h*\\([^)]+\\)(?:\\h\\w+)?)?)(?:\\h{2,}(\\S+))?$', 'gm') const str = `SIG.SND.SERV ZOS FD MCA LPAR (MCA - NDMSRV LOCAL) ADC1 ZOS AMEX SSL ADEPTRA.GB1.PROD LINUX FICO (ADEPTRA) LTD TLS ADEPTRA.GB2.CQA LINUX FICO (ADEPTRA) LTD TLS AIX.EG3C UNIX BARCLAYS S+ AIX.EG3P UNIX BARCLAYS S+ AIX.RMWDEV1 UNIX FDCS AIX.RMWPROD1 UNIX FDCS AIX-EFXWRWCK01 UNIX EQUIFAX EUROPE ANB-DRC-CDFDI NT ARAB NATIONAL BANK (ANB) SSL APPDGVIRTUAL23F NT LTSB MAIL AND DISTRIBUTION APPLCOND MVS CIM ITALIA (FOR BNL) APPLGVIRTUAL0FA NT LTSB MAIL AND DISTRIBUTION TLS APPLGVIRTUAL191 NT LTSB MAIL AND DISTRIBUTION TLS`; // 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