const regex = /^(?:[0-9]+\n|\n)(([0-9:,]+)([\s->]+)([0-9:,]+))$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?:[0-9]+\\n|\\n)(([0-9:,]+)([\\s->]+)([0-9:,]+))$', 'gm')
const str = `1
00:00:04,019 --> 00:00:07,299
- cdcdc
- cddcd
2
00:00:07,414 --> 00:00:09,155
54564
00:00:09,276 --> 00:00:11,429
- 445454 - ccd
- cdscdcdcd
00:00:11,549 --> 00:00:14,874
line1
line2
`;
// 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