foreach my $line (@file_lines) {
         chomp();
         my $match_count=()=($line=~/Memphis/g);
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two observations:

• With the code above you declare $match_count as a local variable of the foreach-loop. Therefore it is not valid when you try to print it
  • => best define that variable before the while-loop
• I suppose you want to count the lines containing Memphis, ...; however you overwrite all your intermediate values with the value of the last line of the file ..
  • => think of using the += operator instead of the =

HTH, Rata