const regex = /^((19\d{2})|(20\d{2}))-(((02)-(0[1-9]|[1-2][0-9]))|(((0(1|[3-9]))|(1[0-2]))-(0[1-9]|[1-2][0-9]|30))|((01|03|05|07|08|10|12)-(31)))$/;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^((19\\d{2})|(20\\d{2}))-(((02)-(0[1-9]|[1-2][0-9]))|(((0(1|[3-9]))|(1[0-2]))-(0[1-9]|[1-2][0-9]|30))|((01|03|05|07|08|10|12)-(31)))$', '')
const str = `2000-12-31`;
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