How can I exclude some characters from a class?

问题

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?

回答1:

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

来源：https://stackoverflow.com/questions/3548949/how-can-i-exclude-some-characters-from-a-class