revert match change - this has problems with older ruby versions

Author: Brent Cook

lib/msf/core/opt_int.rb

@@ -21,7 +21,7 @@ def normalize(value)
 
     def valid?(value, check_empty: true)
       return false if check_empty && empty_required_value?(value)
-      return false if value.present? && !value.to_s.match?(/^0x[0-9a-fA-F]+$|^-?\d+$/)
+      return false if value.present? && !value.to_s.match(/^0x[0-9a-fA-F]+$|^-?\d+$/)
       super
     end
   end