Question

Given

string = 'Stackoverflow is awesome. It answers all my questions';
string = 'Stackoverflow. Q and A site';

I can get everything before the full-stop with string.split('.')[0];

But I only want to do this if full-stop appears after certain number of characters else return everything before the full-stop.

I properly need a regular expression to do this but am not sure how.

Answer 1

There is no need for a regex.

You can just do this:

function trimToDot(s) {
    var head = s.split('.')[0];
    return ( head.length > 20 ) ? head : s;
}