I tried to use this regular expression in devel/emscripten but portscout still lists the version "i64", see here https://portscout.freebsd.org/yuri@freebsd.org.html Many other ports use the same regular expression. It means that it doesn't work everywhere.
Maintainer reset.
Similar problems exist for math/eprover and devel/sdsl-lite. They both contain valid limit: statements which seem to be ignored by portscout.