const regex = /^((?:19|20)(?:(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))|(?:(?![02468][048]|[13579][26])\d){2}\/02\/(?:0[1-9]|[1]\d|2[0-8])|\d{2}\/(?:(?:0[469]|11)\/(?:0[1-9]|[12]\d|30)|(?:0[13578]|10|12)\/(?:0[1-9]|[12]\d|30|31))))$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^((?:19|20)(?:(?:(?:[02468][048]|[13579][26])\\\/02\\\/(?:0[1-9]|[12]\\d))|(?:(?![02468][048]|[13579][26])\\d){2}\\\/02\\\/(?:0[1-9]|[1]\\d|2[0-8])|\\d{2}\\\/(?:(?:0[469]|11)\\\/(?:0[1-9]|[12]\\d|30)|(?:0[13578]|10|12)\\\/(?:0[1-9]|[12]\\d|30|31))))$', 'gm')
const str = ``;
// 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