regex tutorial example typo

[guygastineau]

Given To include a literal -, make it the first or last character ...
and
A domain name shall not start or end with a dash but can contain any number of them

I think the character group [\-]{1} should be [-]{1}
in

docs/docs/regex/tutorial.md

Line 122 in 406c374

^[a-z0-9]+([\-]{1}[a-z0-9]+)*\.[a-z]{2,7}$

[guygastineau]

I already have a patch ready, but I don't see a developmental branch.

[dschaper]

You can use master for this repo.