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

/
/
g

Test String

Code Generator

Generated Code

const regex = /e[yw][A-Za-z0-9-_]+\.(?:e[yw][A-Za-z0-9-_]+)?\.[A-Za-z0-9-_]{2,}(?:(?:\.[A-Za-z0-9-_]{2,}){2})?/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('e[yw][A-Za-z0-9-_]+\\.(?:e[yw][A-Za-z0-9-_]+)?\\.[A-Za-z0-9-_]{2,}(?:(?:\\.[A-Za-z0-9-_]{2,}){2})?', 'g') const str = `JWT pattern - handles both JWS (3 segments) and JWE (5 segments) - remove the ending \`(?:(?:...\` to handle JWS only - segments 1+2 are expected tp start with \`e[yw]\`, an encoded start of JSON object \`{"\` or \`{\\n\` - remove/extend it to match used token structure - or make it even more restrictive \`(ey[IJ]|ewo)\` to match encoded \`{"\\w\` or \`{\\n"\` - payload (2nd segment) may be empty - both header (1st segment) and payload are expected to start with \`eyJ\`, a base64 encoded start of JSON object \`{"\` - accepts only proper Base64url encoding (RFC 4648) without Base64 padding \`=\` - test it at https://regex101.com/r/V99DS0 eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwia2lkIjoicEw1NGdLalBHWElQVWw3eGlGN3B5MExJY3IxNkhPVlZnTXBtWjZqZmFUcUppb1h6M0FSM21EaWpTdXFxNnNvSTBoM1BaNzdMdDUzRjVUbVVPRW5KRGcifQ..LxFPkpn8Gu8vFuXDtOKA1A.DkMr_qOgv6zdyFiZGnz01wnFfLLmoMpRA-L3EbmgOGv21E-yU8ks7C_MSwA6E8KpXAB7XHeejJQWvs5ZrxDM2G8_t_BIJ6DUFXvLvLOzdo0hceeCCtujAgMPsjxW0RQFHkrA2VOlpuF7vVgJXPby19t0_QBWIaZnpfnAYzDJ98UpO1WbNxqGfdpbNG6RETpH.w1H3V7eGynuOi2qJUooceTCvoC4P5sT7bQRqbLZuyR0`; // 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