re-fixes #2637
delimiter used for regex bounds found in neg. lookahead
causes error using @ delimiter now for this expression
Merge pull request #2669 from DaveMC08/feature/re_fixes_2637

re-fixes #2637
partial fix #2667
this fixes the ability to replace a space with a /
and skip the XSS filtering
parse $extra attributes in form_dropdown.
Merge pull request #2671 from aanbar/develop

parse $extra attributes in form_dropdown.
Merge pull request #2670 from DaveMC08/feature/issue_2667

partial fix #2667