const regex = /\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\d|30|31)T([01]\d|2[0-3])[0-5]\d[0-5]\d/;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\\d|30|31)T([01]\\d|2[0-3])[0-5]\\d[0-5]\\d', '')
const str = `20121224T235959
`;
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