Regex: unescape * and + inside […]

Inside […] most chars are literal, such as `*` and `+`, there's no need
to escape them.
Regex: unescape these chars - : !

The hyphen, the colon and the exclamation point are not metacharacters
on their own, you can safely use them unescaped.

- The hyphen is special only when inside […], between two chars
- Colon and exclamation are only special as the syntax for extended
groups (?…)
Regex: unescape : in generator script
Merge pull request #30 from aureliojargas/aj-regex-bogus-escapes

Remove unnecessary escapes from regexes