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    Unmatched ( in regex; marked by <-- HERE in m/mozilla/5.0 ( <-- HERE m
+acintosh; u; safari/525/ at script.pl line 30.
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    # Does $user contain the string from $useragent
$user =~ /\Q$useragent\E/
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    # Is $user equal to the string from $useragent
$user =~ /^\Q$useragent\E\z/
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    # Is $user equal to the string from $useragent
$user eq $useragent