I've tried to master your though very clear "using strings" chapter, but it's still a bit confused

I only wish to do the following with two strings :
subject = "abcdeabcde"
pattern= "cbaaaf"
comparison(subject,pattern)
and then get
- pattern letters found in subject, getting : 4 cbaa
- subject letters missing in pattern, getting : 6 debcde

My strings are lower letters only, I don't care about letters order in my results.
What I really wish to do is to go through the subjectstring and get the following answer for each letters : isinPattern or isnotinPattern. The problem is that I don't know how to tell, once a letter in pattern has been "used" for comparison", not to look at it again :
When I reach the first c (abCdeabcde) in the subject, I should get OK, but when I reach the second c (abcdeabCde), I should get Not in pattern (since there is only one c in my pattern)...
Hoping I'm clear


On the other hand you provide a cool strtoarray function. Maybe I should convert my string to table then try to compare them...