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As others have remarked, I find the problem statement confusing. (In particular, these tired, old optics would have appreciated less eye-bezoggling example strings!) However, a couple of code examples that might help to define the problem:

>perl -wMstrict -le "my $big = 'xyzzyABCDfoobar'; my $small = 'ABCD'; ;; (my $padded = $big) =~ s{ \A (.*?) (\Q$small\E) (.*) } { 'o' x length($1) . $2 . 'i' x length($3) }xmse or die 'small substring not found'; print qq{'$big'}; print qq{'$padded'}; ;; $padded = ''; my $is = index $big, $small; die 'small substring not found' if $is < 0; my $op = $is; my $ip = length($big) - length($small) - $op; $padded = 'o' x $op . $small . 'i' x $ip; print qq{'$big'}; print qq{'$padded'}; " 'xyzzyABCDfoobar' 'oooooABCDiiiiii' 'xyzzyABCDfoobar' 'oooooABCDiiiiii'

Update: Added die on substitution failure in substitution example.


In reply to Re: indexing in strings by AnomalousMonk
in thread indexing in strings by Anonymous Monk

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