Remove unnecessary regex

[CharlesC87]

I replace regex by charcter matching or string_view manipulation.
As we are not c++17 yet in the repo, I added a light version string_view to allow to work with it.

Next commit will be on the parser part with change for regex to speed-up find of correct regex

[ibc]

Thanks. Not sure when we'll be able to review this but will do.

[CharlesC87]

New commit with formatting fix and changes to parser
basically the idea is to avoid regex when possible : in particular when doing the match for attributes (a=) most of teh regex have a prefix of the form ("^name:").
Now we do a string search of "name:" and if not, we avoid a regex match.
If the name is found, we try to match regex on the rest