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Re^2: Lower-casing Substrings and Iterating Two Files together

by kirillm (Friar)
on Dec 27, 2008 at 16:16 UTC ( #732813=note: print w/replies, xml ) Need Help??


in reply to Re: Lower-casing Substrings and Iterating Two Files together
in thread Lower-casing Substrings and Iterating Two Files together

Your proposal seem to assume that there will be one continuous sequence of the N characters in the mask. What if there are non-N characters between $start and $start+$length?

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Re^3: Lower-casing Substrings and Iterating Two Files together
by linuxer (Curate) on Dec 27, 2008 at 16:26 UTC

    Very good question.

    I didn't know about those cases. I only can consider those cases, which are mentioned as examples.

    Update: Here's an update, so it should consider that special case you mentioned. But I had to change the code and remove (r)index.

    #!/usr/bin/perl use strict; use warnings; open SEQ, '<', 'data1.dat' or die $!; open MASK, '<', 'data2.dat' or die $!; while ( my $seq = <SEQ> ) { my $mask = <MASK>; while ( $mask =~ m/(N+)/g ) { my $length = length $1; my $start = pos($mask) - $length; my $lc_seq = lc substr( $seq, $start, $length ); substr( $seq, $start, $length, $lc_seq ); } print $seq; } close MASK; close SEQ;

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