If these are fixed strings, as your example suggests, I'd check existance in a hash constructed with the strings as keys. That will be much faster than sifting through a collection of regexen.

my %match;
@match{@strings) = ();
# to test a var, $check_this
if (exists $match{$check_this}) {
    # ...
}
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Update: This doesn't act like a regex, of course. The presence of a substring in $check_this will not test true. You can adapt by parsing how you expect the strings to appear, or else by iterating the array of @strings over substr instead of a regex - no hash involved there.

After Compline,
Zaxo