How can I exclude some characters from a class?
Say I want to match a "word" character (\w), but exclude "_", or match a whitespace character (\s), but exclude "\t". How can I do this?
Use a negated class including \W or \S.
/[^\W_]/ # anything that's not a non-word character and not _ /[^\S\t]/ # anything that's not a non-space character and not \t