The "$" at the end of your regex means 'match only if "R" followed by five digits' is at the END of your line of data. That said, there are numerous guesses already as to what your data might really look like (Hint: code tags!), so here's another. It may be relevant if your data looks like that in the code below:

#!/usr/bin/perl
use 5.014;

#994367

my @data = ( 'R00005: 00330: C01010 => C00011', 
             'R00005: 00791: C01010 => C00011', 
             'R00005: 01100: C01010 <=> C00011',  
             'R00006: 00770: C00022 => C00900', 
             'R00008: 00362: C06033 => C00022', 
             'R00008: 00660: C00022 => C06033',  
             'R00010: 00500: C01083 => C00031',  
             'R00013: 00630: C00048 => C01146',  
             'R00013: 01100: C00048 <=> C01146', 
            );

for my $data (@data) {
    if ( $data =~ /(R\d{5}).+)/ ) {   # Match on and capture any line 
+which 
                                      # contains the sequence R, 5 dig
+its, and
                                      # something more
                                      # The parens in the regex captur
+e the
                                      # match to $1 (but are not used 
+here)
                                      # which could be used in other a
+pplications.


        say "\t Match on data $data. Hooray!";
    } else {
        say "No match on data $data";
    }
}

# do it again for those beginning "R00005" ONLY
say "\n\n doing it again for 'R00005' ONLY";
for my $data (@data) {
    if ( $data =~ /(R0{4})(5)(.+)/ ) {
        say "\t Match on data " . $1 . $2 . $3 . " Hooray!";  # 3 capt
+ures, 
                                                              # print'
+em
                                                       # NOT a good pr
+actice;
                                                       # illustrate ON
+LY one aspect
                                                       # of regex capt
+ures 

    } else {
        say "No match on data $data";
    }
}

=head output:

         Match on data R00005: 00330: C01010 => C00011. Hooray!
         Match on data R00005: 00791: C01010 => C00011. Hooray!
         Match on data R00005: 01100: C01010 <=> C00011. Hooray!
         Match on data R00006: 00770: C00022 => C00900. Hooray!
         Match on data R00008: 00362: C06033 => C00022. Hooray!
         Match on data R00008: 00660: C00022 => C06033. Hooray!
         Match on data R00010: 00500: C01083 => C00031. Hooray!
         Match on data R00013: 00630: C00048 => C01146. Hooray!
         Match on data R00013: 01100: C00048 <=> C01146. Hooray!


 doing it again for 'R00005' ONLY
         Match on data R00005: 00330: C01010 => C00011. Hooray!
         Match on data R00005: 00791: C01010 => C00011. Hooray!
         Match on data R00005: 01100: C01010 <=> C00011. Hooray!
No match on data R00006: 00770: C00022 => C00900
No match on data R00008: 00362: C06033 => C00022
No match on data R00008: 00660: C00022 => C06033
No match on data R00010: 00500: C01083 => C00031
No match on data R00013: 00630: C00048 => C01146
No match on data R00013: 01100: C00048 <=> C01146

=cut
[download]

See perlretut.

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