Highlighting broken if tr{}{} / y{}{} contains '/'

[chrstphrchvz]

From gisle/tcl.pm#20:

Affects March 2018 TextMate Perl bundle and recent Atom and VS Code.

If transliteration operators have curly braces as the delimiter, i.e. tr{}{} or y{}, and either the pattern or replacement contains exactly one /, then everything up until the next / is highlighted as a regex. See screenshot:

(Example from https://github.com/gisle/tcl.pm/blob/8935cbb97e5d74210cd4397e6c6ccffa792fc054/Makefile.PL#L269)

One workaround is to use a different delimiter such as square brackets [].