... I didn't actually understood that it [~~] may nt work...

It may not work, but the greater danger is that it may work, and the way it works may be changed without notice in some future version of Perl — indeed, depending on the version of Perl you're using, it may already have been changed!

Yes, it's definitely best to keep to the safe, well-lit archives and study halls of the Monastery and avoid the dark, dank cellars where Wizards delve!