Hi, I tried to implement what you have asked me to do but it;s printing nothing

The Part of code is as follows

#!/usr/bin/perl -w
use strict;
#The below variable $mystring is used for some other example
my $mystring = "http://192.168.153.238/nightly_results/2009_12_02/log_
+lcla114.lss.emc.com_64___TestSuitePPAll_TestSuitePPSym_TestSuitePPper
+f_TestSuitePPTx_TestSuitePPConCurrent_Prod_SymmSLV_AIX__3_15.html";
my $sample_sentence = "The kernel bitness:   64";

# ----------- The code corresponds to $mystring ------------#
if($mystring =~ m/nightly_results(.*?)(.html)/) {
    my $web_link= "/nightly_db".$1;
        print $web_link;
}
if($mystring =~ m!([^/]+)$!){  
my $file=$1; 
print "field= $file\n";
}
#-----------Code ends corresponds to $myString -------------#

#----------------- code corresponds to $sample_sentence -----------#
print $sample_sentence =~ /kernel bitness:\s(\d*)/;

#------------- COde ends here b--------------------#
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I was trying to implement $mystring code in the case $sample_sentence as well.But I could not able to display the Appropriate output

Can you do one favor on me in order to extract the desired output ? Because the solution you asked me to implement is not working properly