const regex = /^(((\d{4}\/((0[13578]\/|1[02]\/)(0[1-9]|[12]\d|3[01])|(0[13456789]\/|1[012]\/)(0[1-9]|[12]\d|30)|02\/(0[1-9]|1\d|2[0-8])))|((([02468][048]|[13579][26])00|\d{2}([13579][26]|0[48]|[2468][048])))\/02\/29)){0,10}$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(((\\d{4}\\\/((0[13578]\\\/|1[02]\\\/)(0[1-9]|[12]\\d|3[01])|(0[13456789]\\\/|1[012]\\\/)(0[1-9]|[12]\\d|30)|02\\\/(0[1-9]|1\\d|2[0-8])))|((([02468][048]|[13579][26])00|\\d{2}([13579][26]|0[48]|[2468][048])))\\\/02\\\/29)){0,10}$', 'gm')
const str = `2016-02-29
2019/12/31
29/02/2016
^(?:(?:31(\\/|-|\\.)(?:0?[13578]|1[02]))\\1|(?:(?:29|30)(\\/|-|\\.)(?:0?[1,3-9]|1[0-2])\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})\$|^(?:29(\\/|-|\\.)0?2\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))\$|^(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.)(?:(?:0?[1-9])|(?:1[0-2]))\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})\$
^(((\\d{4}-((0[13578]-|1[02]-)(0[1-9]|[12]\\d|3[01])|(0[13456789]-|1[012]-)(0[1-9]|[12]\\d|30)|02-(0[1-9]|1\\d|2[0-8])))|((([02468][048]|[13579][26])00|\\d{2}([13579][26]|0[48]|[2468][048])))-02-29)){0,10}\$`;
// 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