Just like split(x: Char) (see #65), StringLike relies on the \Q, \E escapes for Regex creation. We now have to deal with the following pattern:

[\Q<char>\E\Q<char>\E<etc>]

This produces regexes such as:

[\Q-\E]

Which then cause an exception in the JavaScript regex matcher.

@sjrd Should we handle this as a hack just like #65, knowing that this is substantially more complex?