Hi I am looking for some help advice on a program I have been wrting for the past few days. What I would like to do is look through a list of filenames that I have already made up, I split the lines on a dot, and for the first part of the line that I call base if it is of the form rrv193 then 4 digits then cm then I rename that $base. Here is a piece of test code to show how I am attemting to do this, but the hash bit doesnt work. Is it because of the expression or becasue you cant do this in a hash? or have I got the wrong end of the stick 
#!/usr/bin/perl

#my hash which tries to "map" a regular expression to a a new name
my %Ren2Dol = (
        rrv193\d{4}cm => "RNF191",
        );

#pretend data line to teest
my $line='rrv1931009cm.new090626';

#split the data line
($base,$rest)=split(/[\.\_]/,$line,2);

#test print it to see that it split correxctly
print "$base\n";

#try to see what new name would be
my $newname=$Ren2Dol{$base};
print "$newname\n";

# a test print to make sure regular expression matches
if ($line=~m/^rrv193\d{4}cm/) {print "line matched\n"};
if ($base=~m/^rrv193\d{4}cm/) {print "base matched\n"};

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In reply to regular expression in a hash by lamasculo

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