gulp watch. Exclude certain files?

Question

Regular Expressions

The code:

gulp.task('watch',  () => {
        watch(['./dev/pug/**/*'], () => gulp.start('pug'));
    }
)

Essence. How to exclude files containing "copy" in the name from the handler?
index - copy of.pug
index - copy of (2).pug
index - copy of (3).pug