const regex = new RegExp('^\\d+(?:\\.\\d+)+\\b(.*)((?:\\n(?!\\d+\\.\\d).*)*)', 'gm')
const str = `1.1 Introduction
There are some sentences in here that I want and I want to do other things with them. There could be hundreds of sentences, who cares.
1.1.1 Something Else
This is where we talk about something else in life.
...
5.1.1 Conclusion`;
// 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