Improve split regrex

[Hashen110]

Add support to clean words with character _

before: console.log(filter.clean("Don't be an ash0le_word")); //Don't be an ash0le_word

after: console.log(filter.clean("Don't be an ash0le_word")); //Don't be an ******word

[TripleFun-Damian]

Unfortunately, this breaks when you have something like this:

clean("_a_s_s_h_o_l_e_")
// "_asshole"

[TripleFun-Damian]

Thinking more about it, I'm not sure it's possible to have a "correct" rule in this case. In some cases, we want the _ character treated as a word break, while in others we want it treated as if it didn't exist. Once you start getting into phrases that combine the two, all bets are off

[ghost]

the easiest way I think would be to omit all symbols. word.replace(/[^a-zA-Z]/g, "")