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 = /InvoiceItemID":"(\d{6})/; // Alternative syntax using RegExp constructor // const regex = new RegExp('InvoiceItemID":"(\\d{6})', '') const str = `{"ClientRef":"","Date":"2015-09-29 10:02:51 AM","InvoiceID":"451393","InvoiceItemID":"495340","Location":"ARN:193602013349538<br\\/>16 LEIGHLAND DR , CITY OF MARKHAM, ON, L3R 7R4","ReportID":"268172,","Type":"ICI Commercial \\/ Industrial Report"},{"ClientRef":"","Date":"2015-09-28 8:39:41 PM","InvoiceID":"451035","InvoiceItemID":"494939","Location":"ARN:190801210003100<br\\/>2250 SHEPPARD AVE W, CITY OF TORONTO, ON, M9M 1L7","ReportID":"267810,","Type":"Basic Report"},{"ClientRef":"","Date":"2015-09-28 8:39:20 PM","InvoiceID":"451034","InvoiceItemID":"494938","Location":"ARN:190801210003100<br\\/>2250 SHEPPARD AVE W, CITY OF TORONTO, ON, M9M 1L7","ReportID":"267809,","Type":"ICI Commercial \\/ Industrial Report"},{"ClientRef":"","Date":"2015-09-28 2:59:03 PM","InvoiceID":"450515","InvoiceItemID":"494348","Location":"ARN:240201011110900<br\\/>26-34 PLAINS RD E, BURLINGTON CITY, ON, L7T 2B9","ReportID":"267272,","Type":"ICI Commercial \\/ Industrial Report"}`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; if ((m = regex.exec(str)) !== null) { // 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