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

/
/
ig

Test String

Code Generator

Language

Generated Code

const regex = /S304JB0...(?<Total1>\d+).(?<Total2>\d+).(?<Total3>\d+).(?<Total4>\d+).(?<Total5>\d+).(?<Total6>\d+).(?<Total7>\d+)(?:R01(?<Row1>\d+))?(?:R02(?<Row2>\d+))?(?:R03(?<Row3>\d+))?(?:R04(?<Row4>\d+))?(?:R05(?<Row5>\d+))?(?:R06(?<Row6>\d+))?(?:R07(?<Row7>\d+))?(?:R08(?<Row8>\d+))?(?:R09(?<Row9>\d+))?(?:R10(?<Row10>\d+))?(?:R11(?<Row11>\d+))?(?:R12(?<Row12>\d+))?(?:R13(?<Row13>\d+))?(?:R14(?<Row14>\d+))?(?:R15(?<Row15>\d+))?/ig; // Alternative syntax using RegExp constructor // const regex = new RegExp('S304JB0...(?<Total1>\\d+).(?<Total2>\\d+).(?<Total3>\\d+).(?<Total4>\\d+).(?<Total5>\\d+).(?<Total6>\\d+).(?<Total7>\\d+)(?:R01(?<Row1>\\d+))?(?:R02(?<Row2>\\d+))?(?:R03(?<Row3>\\d+))?(?:R04(?<Row4>\\d+))?(?:R05(?<Row5>\\d+))?(?:R06(?<Row6>\\d+))?(?:R07(?<Row7>\\d+))?(?:R08(?<Row8>\\d+))?(?:R09(?<Row9>\\d+))?(?:R10(?<Row10>\\d+))?(?:R11(?<Row11>\\d+))?(?:R12(?<Row12>\\d+))?(?:R13(?<Row13>\\d+))?(?:R14(?<Row14>\\d+))?(?:R15(?<Row15>\\d+))?', 'ig') const str = `12*000000000**S304JB01811*8*0*8*4*4*34R0332R152~~~ 12*000000000**S304JB01811*9*0*4*3*4*224R023R032R10234R1325~~~ `; // 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