JavaScript / ECMAScript

Named Capture Group (Date) in JS

Demonstrate named capture groups by extracting year/month/day from ISO-style dates.

Try it in the JS tester →

Pattern

regexJS
(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})   (flags: g)

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("(?<year>\\d{4})-(?<month>\\d{2})-(?<day>\\d{2})", "g");
const input = "Born 1990-05-21, hired 2018-09-10";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

How the pattern works

(?<year>\d{4}) captures four digits under the name 'year'; (?<month>\d{2}) and (?<day>\d{2}) likewise. Modern JS, Python 3.7+, and Go (with `(?P<...>)` syntax — JS-style is also accepted in Python 3.12+) all support this; the matched substring is accessible by name in code (e.g. m.groups.year in JS, m['year'] in Python).

Examples

Input

Born 1990-05-21, hired 2018-09-10

Matches

  • 1990-05-21
  • 2018-09-10

Input

Today is 2026-04-25

Matches

  • 2026-04-25

Input

no dates here

No match

—

Same pattern, other engines

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

Go (RE2)

Supported

See how this pattern looks (and behaves) in Go's `regexp` package (RE2 engine).

← Back to Named Capture Group (Date) overview (all engines)