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

/
/
gi

Test String

Code Generator

Language

Generated Code

const regex = /(begin|end|version|cell|adr|nickname|photo|bday|anniversary|gender|tel|email|impp|lang|tz|geo|title|role|logo|org|member|related|categories|note|prodid|rev|sound|uid|fn|n):(.*?)(?=(?:begin|end|version|cell|adr|nickname|photo|bday|anniversary|gender|tel|email|impp|lang|tz|geo|title|role|logo|org|member|related|categories|note|prodid|rev|sound|uid|fn|n):|\n|$)/gi; // Alternative syntax using RegExp constructor // const regex = new RegExp('(begin|end|version|cell|adr|nickname|photo|bday|anniversary|gender|tel|email|impp|lang|tz|geo|title|role|logo|org|member|related|categories|note|prodid|rev|sound|uid|fn|n):(.*?)(?=(?:begin|end|version|cell|adr|nickname|photo|bday|anniversary|gender|tel|email|impp|lang|tz|geo|title|role|logo|org|member|related|categories|note|prodid|rev|sound|uid|fn|n):|\\n|$)', 'gi') const str = `BEGIN:VCARDFN:Barend VercauterenTEL:+32(0)9 329 93 06EMAIL:Barend.Vercauterenëesc.beURL:http://www.esc.beN:Vercauteren;BarendADR:Grote Steenweg 39;9840;De PinteORG:ESC bvbaROLE:sales consultantVERSION:3.0END:VCARD BEGIN:VCARDVERSION:2.1N:Deblieck;Tommy;;DhrFN:Tommy DeblieckTITLE:ZaakvoerderORG:QBMT bvbaADR:;;Kleine Pathoekweg 44;Brugge;West-Vlaanderen;8000;Belgi≠A0171TEL;WORK;PREF:+32 479302972TEL;CELL:+32 479302972EMAIL:tdëqbmt.beURL:www.qbis.beEND:VCARD`; // 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