get all ranges of a substring in a string in swift

Question

I have a string for example \"ab ad adk fda kla kad ab ab kd\". I want to get all range of ab.(Here ab is present at 3 position so I should get 3 range).In normal scenarion

Answer 1

You are using regular expressions, so you need to take care about characters that have special meaning - . is only one of them.

If you're doing a search for substrings, I suggest to use the good old rangeOf... methods instead:

func rangeOfString(_ searchString: String,
           options mask: NSStringCompareOptions,
             range searchRange: NSRange) -> NSRange

Just keep calling that method on your string (and adjust the searchRange), until no further matches are found.