Slightly simplified version:
==> go.mod <==
module example.com
go 1.20
==> main.go <==
package main
import (
"plugin"
"regexp/syntax"
)
func main() {
if syntax.Perl != 212 {
panic("Unexpected flags")
}
p, err := plugin.Open("p1.so")
if err != nil {
panic(err)
}
s, err := p.Lookup("F")
if err != nil {
panic(err)
}
f := s.(func())
f()
}
==> p1/plugin.go <==
package main
import (
"regexp"
)
func F() {
_ = regexp.MustCompile(`\w+`)
}
func main() {}
FWIW, it also fails in the same way on macOS:
$ go build -buildmode=plugin ./p1 && go run main.go
panic: regexp: Compile(`\w+`): error parsing regexp: invalid escape
sequence: `\w`
goroutine 1 [running]:
regexp.MustCompile({0x107aa6eea, 0x3})
/usr/local/go/src/regexp/regexp.go:319 +0xb4
example.com/p1.F()
/Users/brian/tmp/go/62430/p1/plugin.go:8 +0x1f
main.main()
/Users/brian/tmp/go/62430/main.go:23 +0x103
exit status 2
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