return indexes of all regex occurrences in string in Ruby

Question

How do I obtain an array of the indexes (or positions) all occurrences of a regexp in a string?

example_string= "hello how are you?

I would like to obtain the array [1,12] for regexp /e/

Answer 1

Here's one approach to get an array of indexes of matches:

example_string = "hello how are you?"

example_string.enum_for(:scan, /e/).map { Regexp.last_match.begin(0) }

# => [1, 12]

Hope it helps!