Regular Expressions 101

Save & Manage Regex

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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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = /^AD[0-9]{2}[0-9]{4}[0-9]{4}[A-Z0-9]{12}$|^AE[0-9]{2}[0-9]{3}[0-9]{16}|AL[0-9]{2}[0-9]{8}[A-Z0-9]{16}$|^AT[0-9]{2}[0-9]{5}[0-9]{11}$|^AZ[0-9]{2}[A-Z]{4}[A-Z0-9]{20}$|^BA[0-9]{2}[0-9]{3}[0-9]{3}[0-9]{8}[0-9]{2}$|^BE[0-9]{2}[0-9]{3}[0-9]{7}[0-9]{2}$|^BG[0-9]{2}[A-Z]{4}[0-9]{4}[0-9]{2}[A-Z0-9]{8}$|^BH[0-9]{2}[A-Z]{4}[A-Z0-9]{14}$|^BR[0-9]{2}[0-9]{8}[0-9]{5}[0-9]{10}[A-Z][A-Z0-9]$|^CH[0-9]{2}[0-9]{5}[A-Z0-9]{12}$|^CR[0-9]{2}[0-9]{3}[0-9]{14}$|^CY[0-9]{2}[0-9]{3}[0-9]{5}[A-Z0-9]{16}$|^CZ[0-9]{2}[0-9]{20}$|^DE[0-9]{2}[0-9]{8}[0-9]{10}$|^DO[0-9]{2}[A-Z0-9]{4}[0-9]{20}$|^DK[0-9]{2}[0-9]{14}$|^EE[0-9]{2}[0-9]{2}[0-9]{2}[0-9]{11}[0-9]{1}$|^ES[0-9]{2}[0-9]{4}[0-9]{4}[0-9]{1}[0-9]{1}[0-9]{10}$|^FI[0-9]{2}[0-9]{6}[0-9]{7}[0-9]{1}$|^FO[0-9]{2}[0-9]{4}[0-9]{9}[0-9]{1}$|^FR[0-9]{2}[0-9]{5}[0-9]{5}[A-Z0-9]{11}[0-9]{2}$|^GB[0-9]{2}[A-Z]{4}[0-9]{6}[0-9]{8}$|^GE[0-9]{2}[A-Z]{2}[0-9]{16}$|^GI[0-9]{2}[A-Z]{4}[A-Z0-9]{15}$|^GL[0-9]{2}[0-9]{4}[0-9]{9}[0-9]{1}$|^GR[0-9]{2}[0-9]{3}[0-9]{4}[A-Z0-9]{16}$|^GT[0-9]{2}[A-Z0-9]{4}[A-Z0-9]{20}$|^HR[0-9]{2}[0-9]{7}[0-9]{10}$|^HU[0-9]{2}[0-9]{3}[0-9]{4}[0-9]{1}[0-9]{15}[0-9]{1}$|^IE[0-9]{2}[A-Z]{4}[0-9]{6}[0-9]{8}$|^IL[0-9]{2}[0-9]{3}[0-9]{3}[0-9]{13}$|^IS[0-9]{2}[0-9]{4}[0-9]{2}[0-9]{6}[0-9]{10}$|^IT[0-9]{2}[A-Z]{1}[0-9]{5}[0-9]{5}[A-Z0-9]{12}$|^KW[0-9]{2}[A-Z]{4}[0-9]{22}$|^KZ[0-9]{2}[0-9]{3}[A-Z0-9]{13}$|^LB[0-9]{2}[0-9]{4}[A-Z0-9]{20}$|^LI[0-9]{2}[0-9]{5}[A-Z0-9]{12}$|^LT[0-9]{2}[0-9]{5}[0-9]{11}$|^LU[0-9]{2}[0-9]{3}[A-Z0-9]{13}$|^LV[0-9]{2}[A-Z]{4}[A-Z0-9]{13}$|^MC[0-9]{2}[0-9]{5}[0-9]{5}[A-Z0-9]{11}[0-9]{2}$|^MD[0-9]{2}[A-Z0-9]{20}$|^ME[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^MK[0-9]{2}[0-9]{3}[A-Z0-9]{10}[0-9]{2}$|^MR13[0-9]{5}[0-9]{5}[0-9]{11}[0-9]{2}$|^MT[0-9]{2}[A-Z]{4}[0-9]{5}[A-Z0-9]{18}$|^MU[0-9]{2}[A-Z]{4}[0-9]{2}[0-9]{2}[0-9]{12}[0-9]{3}[A-Z]{3}$|^NL[0-9]{2}[A-Z]{4}[0-9]{10}$|^NO[0-9]{2}[0-9]{4}[0-9]{6}[0-9]{1}$|^PK[0-9]{2}[A-Z]{4}[A-Z0-9]{16}$|^PL[0-9]{2}[0-9]{8}[0-9]{16}$|^PS[0-9]{2}[A-Z]{4}[A-Z0-9]{21}$|^PT[0-9]{2}[0-9]{4}[0-9]{4}[0-9]{11}[0-9]{2}$|^RO[0-9]{2}[A-Z]{4}[A-Z0-9]{16}$|^RS[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^SA[0-9]{2}[0-9]{2}[A-Z0-9]{18}$|^SE[0-9]{2}[0-9]{3}[0-9]{16}[0-9]{1}$|^SI[0-9]{2}[0-9]{5}[0-9]{8}[0-9]{2}$|^SK[0-9]{2}[0-9]{4}[0-9]{6}[0-9]{10}$|^SM[0-9]{2}[A-Z]{1}[0-9]{5}[0-9]{5}[A-Z0-9]{12}$|^TN59[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^TR[0-9]{2}[0-9]{5}[A-Z0-9]{1}[A-Z0-9]{16}$|^VG[0-9]{2}[A-Z]{4}[0-9]{16}$/; // Alternative syntax using RegExp constructor // const regex = new RegExp('^AD[0-9]{2}[0-9]{4}[0-9]{4}[A-Z0-9]{12}$|^AE[0-9]{2}[0-9]{3}[0-9]{16}|AL[0-9]{2}[0-9]{8}[A-Z0-9]{16}$|^AT[0-9]{2}[0-9]{5}[0-9]{11}$|^AZ[0-9]{2}[A-Z]{4}[A-Z0-9]{20}$|^BA[0-9]{2}[0-9]{3}[0-9]{3}[0-9]{8}[0-9]{2}$|^BE[0-9]{2}[0-9]{3}[0-9]{7}[0-9]{2}$|^BG[0-9]{2}[A-Z]{4}[0-9]{4}[0-9]{2}[A-Z0-9]{8}$|^BH[0-9]{2}[A-Z]{4}[A-Z0-9]{14}$|^BR[0-9]{2}[0-9]{8}[0-9]{5}[0-9]{10}[A-Z][A-Z0-9]$|^CH[0-9]{2}[0-9]{5}[A-Z0-9]{12}$|^CR[0-9]{2}[0-9]{3}[0-9]{14}$|^CY[0-9]{2}[0-9]{3}[0-9]{5}[A-Z0-9]{16}$|^CZ[0-9]{2}[0-9]{20}$|^DE[0-9]{2}[0-9]{8}[0-9]{10}$|^DO[0-9]{2}[A-Z0-9]{4}[0-9]{20}$|^DK[0-9]{2}[0-9]{14}$|^EE[0-9]{2}[0-9]{2}[0-9]{2}[0-9]{11}[0-9]{1}$|^ES[0-9]{2}[0-9]{4}[0-9]{4}[0-9]{1}[0-9]{1}[0-9]{10}$|^FI[0-9]{2}[0-9]{6}[0-9]{7}[0-9]{1}$|^FO[0-9]{2}[0-9]{4}[0-9]{9}[0-9]{1}$|^FR[0-9]{2}[0-9]{5}[0-9]{5}[A-Z0-9]{11}[0-9]{2}$|^GB[0-9]{2}[A-Z]{4}[0-9]{6}[0-9]{8}$|^GE[0-9]{2}[A-Z]{2}[0-9]{16}$|^GI[0-9]{2}[A-Z]{4}[A-Z0-9]{15}$|^GL[0-9]{2}[0-9]{4}[0-9]{9}[0-9]{1}$|^GR[0-9]{2}[0-9]{3}[0-9]{4}[A-Z0-9]{16}$|^GT[0-9]{2}[A-Z0-9]{4}[A-Z0-9]{20}$|^HR[0-9]{2}[0-9]{7}[0-9]{10}$|^HU[0-9]{2}[0-9]{3}[0-9]{4}[0-9]{1}[0-9]{15}[0-9]{1}$|^IE[0-9]{2}[A-Z]{4}[0-9]{6}[0-9]{8}$|^IL[0-9]{2}[0-9]{3}[0-9]{3}[0-9]{13}$|^IS[0-9]{2}[0-9]{4}[0-9]{2}[0-9]{6}[0-9]{10}$|^IT[0-9]{2}[A-Z]{1}[0-9]{5}[0-9]{5}[A-Z0-9]{12}$|^KW[0-9]{2}[A-Z]{4}[0-9]{22}$|^KZ[0-9]{2}[0-9]{3}[A-Z0-9]{13}$|^LB[0-9]{2}[0-9]{4}[A-Z0-9]{20}$|^LI[0-9]{2}[0-9]{5}[A-Z0-9]{12}$|^LT[0-9]{2}[0-9]{5}[0-9]{11}$|^LU[0-9]{2}[0-9]{3}[A-Z0-9]{13}$|^LV[0-9]{2}[A-Z]{4}[A-Z0-9]{13}$|^MC[0-9]{2}[0-9]{5}[0-9]{5}[A-Z0-9]{11}[0-9]{2}$|^MD[0-9]{2}[A-Z0-9]{20}$|^ME[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^MK[0-9]{2}[0-9]{3}[A-Z0-9]{10}[0-9]{2}$|^MR13[0-9]{5}[0-9]{5}[0-9]{11}[0-9]{2}$|^MT[0-9]{2}[A-Z]{4}[0-9]{5}[A-Z0-9]{18}$|^MU[0-9]{2}[A-Z]{4}[0-9]{2}[0-9]{2}[0-9]{12}[0-9]{3}[A-Z]{3}$|^NL[0-9]{2}[A-Z]{4}[0-9]{10}$|^NO[0-9]{2}[0-9]{4}[0-9]{6}[0-9]{1}$|^PK[0-9]{2}[A-Z]{4}[A-Z0-9]{16}$|^PL[0-9]{2}[0-9]{8}[0-9]{16}$|^PS[0-9]{2}[A-Z]{4}[A-Z0-9]{21}$|^PT[0-9]{2}[0-9]{4}[0-9]{4}[0-9]{11}[0-9]{2}$|^RO[0-9]{2}[A-Z]{4}[A-Z0-9]{16}$|^RS[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^SA[0-9]{2}[0-9]{2}[A-Z0-9]{18}$|^SE[0-9]{2}[0-9]{3}[0-9]{16}[0-9]{1}$|^SI[0-9]{2}[0-9]{5}[0-9]{8}[0-9]{2}$|^SK[0-9]{2}[0-9]{4}[0-9]{6}[0-9]{10}$|^SM[0-9]{2}[A-Z]{1}[0-9]{5}[0-9]{5}[A-Z0-9]{12}$|^TN59[0-9]{2}[0-9]{3}[0-9]{13}[0-9]{2}$|^TR[0-9]{2}[0-9]{5}[A-Z0-9]{1}[A-Z0-9]{16}$|^VG[0-9]{2}[A-Z]{4}[0-9]{16}$', '') const str = `GB29NWBK60161331926819`; // 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