The reason for the "uninitialized" warnings is that you have an off-by-one error in your for loops. They attempt to go beyond the size of the array. You can prove this to yourself by printing the value of $a, for example, inside your outermost loop. The quickest fix is to change <= to <. For example, change: 
for ($a=0; $a<= scalar(@abst_listing); $a++){

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to: 

for ($a=0; $a< scalar(@abst_listing); $a++){

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A more Perl-ish way to create this for loop is as follows: 

for my $a (0 ..  $#abst_listing){

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Notice that I declared the loop variable in the for statement itself. You should do the same for your b and c loops as well.

If you had shown some actual data, it would be easier to figure out why you are not getting the matches you expect. Perhaps some other tips in the Basic debugging checklist will help you. If your arrays contain metacharacters, perhaps you need to use quotemeta for your regular expressions. You could try to chomp your arrays, then simplify your regexes by removing the //m modifiers.

As a side note, your get_data sub is very similar to File::Slurp::read_file. 

use lib'/usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/DBD/mys
+ql.pm';

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I don't think that does what you want. lib "is typically used to add extra directories to perl's search path", but you are trying to specify a module file. Perhaps this is what you meant: 
use lib '/usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi';

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Update: fixed typo (thanks amedico).

In reply to Re: Some problem pattern matching by toolic
in thread Some problem pattern matching by eMBR_chi

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