const regex = /^No (?<no>\d{1,3}) (?<title>(?:[^(\r\n]+|\((?!\d\)))+)(?:\((?<weeks>\d)\))?/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^No (?<no>\\d{1,3}) (?<title>(?:[^(\\r\\n]+|\\((?!\\d\\)))+)(?:\\((?<weeks>\\d)\\))?', 'gm')
const str = `No 1 And Your Bird Can Sing (4)
No 2 Baby, You're a Rich Man (5)
No 3 Blue Jay Way S
No 4 Everybody's Got Something to Hide Except Me and My Monkey (1)`;
// 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