Add new chapter: replacing sub-strings

[Data-Meister]

As discussed, here's a new chapter

[sukima]

Interesting alternative to RegExps. Most devs would lean to RegExps because it is familiar and expected. Insert comment about readability here.

Nit Picks

I think most of the code examples in this repo use double-quotes instead of single-quotes and they don't have spaces inside the parenthesis.

[Data-Meister]

okay I've made the changes suggested

IMO this is simpler than RegExps because RegExps require you to escape certain characters.

This is especially problematic if you are using a RegExp on a variable string, because certain characters need to be double escaped

you're right it's less intuitive/readable. but at the other day, this is JavaScript. Other languages have this kind of thing built in

[sukima]