List of metacharacters for MySQL regexp square brackets

Question

Strangely I can\'t seem to find anywhere a list of the characters that I can\'t safely use as literals within MySQL regular expression square brackets without escaping them

Answer 1

From the documentation, right near the top:

This section summarizes, with examples, the special characters and constructs that can be used in MySQL for REGEXP operations. It does not contain all the details that can be found in Henry Spencer's regex(7) manual page. That manual page is included in MySQL source distributions, in the regex.7 file under the regex directory.

Said manpage can be found copied here (thanks, Google!). The information you're looking for is available in there.