Was wondering if there is an 'efficient/elegant' way to do the following (without tidyverse). Take a string

abaaabbaaaaabaaab

Its easy enough to count the number of times the character 'b' shows up in the string, but...what I'm looking for is outputing the 'intervals' between occurrences of 'b' (starting the counter at the beginning of the string). So, for the preceding example, 'b' shows up in positions

2, 6, 7, 13, 17

So, the interval data would be: 2, 4, 1, 6, 4

My main approach has been to simply output positions (say, something like unlist(gregexpr('b', target_string))), and 'do the math' between successive positions. Can anyone suggest a more elegant approach?

Thanks in advance...

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