String processing

dovah has asked for the wisdom of the Perl Monks concerning the following question:

Hi! I'd like to ask for help because my code isn't behaving correctly (and I can't figure out why). So, here's my issue. I have to deduce positions in a "simple string" given positions in a "complete string". Here's a minimal exemple of my input file:

#name   complete(cs)    len(cs) simple(ss)  len(ss) pos(cs)
NAME1   A0AAA000AAA00A  14      AAAAAAAA    8        4,6            
NAME2   AAAA0AA00000A   13      AAAAAAA     7        7
[download]

Here's my code:

$ perl -anle '
    print "$_ position(cs)" and next if /^#/;
    printf "%s",$_;
    for $pos_ss (split ",",$F[5]) {
        $char = substr($F[1],$pos_ss-1,1);
        @cs = split //,$F[3];
        @cs_idx = grep {$cs[$_] eq $char} 0..$#cs;
        push @res,++$cs_idx[$pos_ss-1];
    }
    printf "%14s\n", join ",",@res;
    @res=();
' file
[download]

And here's my expected output:

NAME1   A0AAA000AAA00A  14      AAAAAAAA    8        4,9    3,5
NAME2   AAAA0AA00000A   13      AAAAAAA     7        7          6
[download]

In the provided exemple, I have to say that the 4th character (which is the 3rd "A") in the complete string(cs) corresponds to the the 3rd character in the simple string(ss), and so on... Could you please help me formatting/reviewing my code? Thanks in advance for your precious help!!

Comment on String processing Select or Download Code

Replies are listed 'Best First'.
Re: String processing by Anonymous Monk on Jul 31, 2014 at 12:29 UTC
Solved with a long-liner: `perl -aple '$" = ","; my $rx = join "", map qq((\Q$_\E)?), split //, $ +F[1]; chomp; $_ .= " @{[map $_+1, @-[split /,/, $F[5]]]}" if $F[3] = +~ $rx;'` [download]	[reply] [d/l]
Re^2: String processing by Anonymous Monk on Jul 31, 2014 at 12:38 UTC
Ahem, using `@+` saves some strokes: `perl -aple '$" = ","; my $rx = join "", map qq((\Q$_\E)?), split //, $ +F[1]; chomp; $_ .= " @{[@+[split /,/, $F[5]]]}" if $F[3] =~ $rx;'` [download]	[reply] [d/l] [select]
Re: String processing by Anonymous Monk on Jul 31, 2014 at 15:48 UTC
You can save some more (and still use printf): `perl -lane '$F[3] =~ ($F[1] =~ s/./($&)?/gr) && printf "%-60s%s\n", $_, join ",", @+[eval "$F[5]"]'` [download] OP, I THINK we're trying to say that your code is difficult to read. I THINK there is a bug in your code, but I'm not sure. Write a real script, and you'll get better answers...	[reply] [d/l]
Re^2: String processing by Anonymous Monk on Jul 31, 2014 at 16:25 UTC
Forgot the skipping comments part! :) `perl -lane '/^#/ \|\| $F[3]=~($F[1]=~s/./($&)?/gr) && printf "%-50s%s\n", $_, join ", ", @+[eval $F[5]]'` [download]	[reply] [d/l]


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