const regex = /^(R\d*\/)?P(\d+([\.,]\d+)?Y)?(\d+([\.,]\d+)?M)?(\d+([\.,]\d+)?W)?(\d+([\.,]\d+)?D)?((?!.$)T(\d+([\.,]\d+)?H)?(\d+([\.,]\d+)?M)?(\d+(\.\d+)?S)?)?$/;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(R\\d*\\\/)?P(\\d+([\\.,]\\d+)?Y)?(\\d+([\\.,]\\d+)?M)?(\\d+([\\.,]\\d+)?W)?(\\d+([\\.,]\\d+)?D)?((?!.$)T(\\d+([\\.,]\\d+)?H)?(\\d+([\\.,]\\d+)?M)?(\\d+(\\.\\d+)?S)?)?$', '')
const str = ``;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
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