How to find and replace all occurrences of a substring in a string?

Question

I need to search a string and edit the formatting of it.

So far I can replace the first occurrence of the string, but I am unable to do so with the next occurrences

Answer 1

The find function takes an optional second argument: the position from which to begin searching. By default this is zero.

A good position to begin searching for the next match is the position where the previous replacement was inserted, plus that replacement's length. For instance if we insert a string of length 3 at position 7, then the next find should begin at position 10.

If the search string happens to be a substring of the replacement, this approach will avoid an infinite loop. Imagine if you try to replace all occurrences of log with analog, but don't skip over the replacement.