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Hi all! I have this assignment to give in Biology class and I am stuck. Assignment: I am given a sequence of letters, say:
XXXXXXABCDXXXXXXXX
and I am interested in part ABCD, which represents letters #7-#10 as you can see. I am then given the same sequence, which now contains characters like * and !(only these 2 are allowed), say:
XX**XXX!!!X**AB*!C*DXX*!!!XXX**XXX
and I want to find out which letters now represent the part ABCD. If you count, you see that ABCD is now letters #14-#20 [4*and! were added prior to A and 10 prior to D
What I think must be done is:
1) check how many (if any) * or/and ! were added prior to start letter A(#7)
2) check how many (if any) * or/and ! were added prior to end letter D(#10)
3) add all * and/or ! to starting and ending letter of part ABCD
Has anyone got any hints to give me as to which functions of Perl will be useful for this problem?

In reply to confused with strings by ktsirig

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