Note that the results for the examples of the two methods differ: 

c:\@Work\Perl\monks>perl -wMstrict -le
"my @cases = qw/ABA SCO ACC PHC GHF/;
 my $re = join '|', @cases;
 ;;
 for my $text ('SCO', 'ENDOSCOPE', 'Microsoft') {
   print qq{'$text' found (grep)}  if grep { $text eq $_ } @cases;
   print qq{'$text' found (regex)} if $text =~ /^$re$/;
   }
"
'SCO' found (grep)
'SCO' found (regex)
'ENDOSCOPE' found (regex)

[download]
See haukex's Building Regex Alternations Dynamically.

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Sparing multiple 'or's by AnomalousMonk
in thread Sparing multiple 'or's by Denis

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