I have searched within SO and found out several regular expressions to be used to include ONLY THESE `a-z A-Z 0-9 - _`. So far what I have tried was this one, `/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s`. What this actually did was it did not exclude `brackets {} []` and `parenthesis ()`. I am not very experienced with `regex`, heck I don't fully fathom the whole meaning, structure/format of it so can somebody provide me the exact `regex` which I am looking for? Thanks for the time.