How to get all NSRange of a particular character in a NSString?

Question

I have two NSStrings: orgText and searchLetter.
I want to highlight every occurrences of the searchLetter in the orgText with a re

Answer 1

this is an easier way of doing it

NSString *str = @"hello world";
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:str];
[attr addAttributes:@{NSForegroundColorAttributeName : [UIColor redColor]} 
              range:[str rangeOfString:@"world"]];