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 = /(?P<smlouva>[0-9]{10})\s(?:|(?P<flotila>[0-9]{10})\s)(?P<kod>[A-Z0-9]{3})\s(?<rc_ic>[0-9]+)\s(?<klient>\S+ \S+)\s(?P<zaklad>-?[0-9 ]+,[0-9]{2})\s(?P<od>[0-9.]+)\s(?P<do>[0-9.]+)\s(?P<zarazeni>\S+)\s(?P<provize>-?[0-9 ]+,[0-9]{2})/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?P<smlouva>[0-9]{10})\\s(?:|(?P<flotila>[0-9]{10})\\s)(?P<kod>[A-Z0-9]{3})\\s(?<rc_ic>[0-9]+)\\s(?<klient>\\S+ \\S+)\\s(?P<zaklad>-?[0-9 ]+,[0-9]{2})\\s(?P<od>[0-9.]+)\\s(?P<do>[0-9.]+)\\s(?P<zarazeni>\\S+)\\s(?P<provize>-?[0-9 ]+,[0-9]{2})', 'gm') const str = `Získatelská-život Smlouva č. Flotila/pův.čps Kód RČ/IČ Klient Základ Období od. Období do. Zařazení Provize 1442225650 7BN 8508142236 Šxxxx Rxxx 7 116,00 01.08.2018 01.08.2019 získatelská 10 674,00 1442226302 7BN 8559150666 Paxxxxxxx Jxxx 19 800,00 01.08.2018 01.08.2019 získatelská 29 700,00 1442226325 7BN 9411250057 Mxxxx Dxxxx 7 920,00 01.08.2018 01.08.2019 získatelská 11 880,00 1442230798 7BN 7309170572 Kxxxxx Mxxx 6 720,00 01.08.2018 01.08.2019 získatelská 10 080,00 Získatelská-neživot Smlouva č. Flotila/pův.čps Kód RČ/IČ Klient Základ Období od. Období do. Zařazení Provize 3951263358 1BB 9451055141 Bxxxxxx Lxxx 860,00 17.05.2018 17.05.2019 získatelská 93,00 3951291767 1BB 6852200333 Kxxxxxxx Mxxxx 1 210,00 20.07.2018 20.07.2019 získatelská 131,00 3951289137 1BD 61491853 Mxxxxx HxxxxÍ 16 510,00 12.07.2018 12.07.2019 získatelská 7 925,00 8930218318 8602948105 TR7 45798052 xxx s.r.o. / G.x.x.x., xx./ 5 950,00 04.08.2018 04.08.2019 pečovatelská 893,00 8930219821 8602951021 TR7 24684911 xx Šxxxxx s.r.o. -14 455,00 03.08.2018 03.08.2019 pečovatelská -2 168,00 3951263358 8602951021 1BB 9451055141 Bxxxxxx Lucie 860,00 17.05.2018 17.05.2019 získatelská 93,00`; // 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