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

Generated Code

const regex = /([^EAN]*$)*\d{3}\d{4,6}\d{3,5}\d/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('([^EAN]*$)*\\d{3}\\d{4,6}\\d{3,5}\\d', 'gm') const str = `EAN\\n\\n0889842596601\\n\\nUtilização\\n\\nMobilidade\\n\\nProcessador\\n\\nIntel® Core™ m3-8100Y Dual Core\\n\\nFrequência\\n\\n1,1 GHz\\n\\nCache Processador\\n\\n4 MB\\n\\nMemória RAM\\n\\n8 GB\\n\\nTipo Memória\\n\\nLPDDR3\\n\\nPlaca(s) Gráfica(s)\\n\\nIntel HD Graphics\\n\\nDisco SSD\\n\\n128 GB\\n\\nDimensão Ecrã\\n\\n10,51 ''\\n\\nTipo de Ecrã\\n\\nEcrã tátil PixelSense com resolução 1920 x 1280\\n\\nSistema Áudio\\n\\nAltifalantes estéreo 2W\\n\\nLeitor de Cartões\\n\\nLeitor de cartões microSD\\n\\nInterfaces\\n\\n1x USB-CSurface Connect™Jack 3,5mm\\n\\nCâmara\\n\\nCâmara frontal de 5 MP com 1080pCâmara posterior de 8 MP com 1080p\\n\\nComunicações\\n\\nWi-Fi 6 802.11axBluetooth 5.0LTE com suporte nanoSIM e eSIM\\n\\nSistema Operativo\\n\\nWindows 10 Home em modo S (64-bit)\\n\\nBateria\\n\\nLi-ion\\n\\nAutonomia (estimativa)\\n\\nAté 9,5 horas\\n\\nOutras Funcionalidades\\n\\nAcelerômetroMagnetômetroGiroscópioSensor de luz ambiente\\n\\nDimensões\\n\\n24,5 x 17,5 x 0,83 cm\\n\\nPeso\\n\\n0,54 Kg\\n\\nAcessórios\\n\\nFonte de alimentação\\n\\nOutros\\n\\nCapa teclado vendida separadamente\\n\\nMenção Legal\\n\\nTenha em atenção o país de expedição do vendedor, pois o `; // 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