Since JavaScript RegExp doesn't allow LookBehind, how can I achieve same results with another way?

Question

Explain only with RegExp.

Answer 1

Lentin, do you have some random regex that you want to match? If no, I'll use a random one as expression.
var str = "Valentinhacker is a hacker" ;
If you want to capitalize the H in your name, using lookbehind will be something like,
str = str.replace(/(?<=Valentin)./, char => char.toUpperCase()) (is it correct?)

But since lookbehinds are not available, you can do str = "Valentin" + str.match(/Valentin(.)/)[1].toUpperCase() + "acker".

Btw, if you have sth to match, I can help you.

Answer 2

I've read somewhere that it's indeed done by reversing but i don't know how to reverse...^_^

Answer 3

I asked this question because i had trouble with my code "Table Builder" but i found a workaround ^_^

Answer 4

You can reverse a String using the following:
function reverse(s) {
return s.split('').reverse().join('');
}

Answer 5

As I'm reading this fascinating topic and pondering who wrote the first RegEx parser, I note that lookahead is fully supported.

And I wonder...would reversing the string be a useful start?

Answer 6

Yes, I tried using ?<= but it says invalid regular expression -_-