benchmark,lib,test,tools: remove unneeded . escape

The `.` character does not need to be escaped when it appears inside a
regular expression character class. This removes instances of
unnecessary escapes of the `.` character.

This also removes a few unnecessary escapes of the `(` and `)`
characters within character classes too.

PR-URL: https://github.com/nodejs/node/pull/9449


Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Minwoo Jung <jmwsoft@gmail.com>
Reviewed-By: James Snell <jasnell@gmail.com>