BIG_DECIMAL!!!!!)

You don't have to use Integer.MAX_VALUE here.
I'm not sure about efficiency but it makes more sense to assign the variable smallest to args[0].

And not clever)))

not best practice at all

I had no idea how to add a variable to a regular expression, my solution was to generate a string using the variable, and pass the string to create a new regular expression object, your code is much nicer!