[tialaramex]

Although the phrase "pattern matching" is involved these are completely different features.

Also, unlike for regular expressions what you actually want here is typically a language feature, even if a bunch of the lifting is done in your standard library. In particular you probably want a keyword (or in several C++ pattern matching proposals, more than one) and new behaviour not just a few functions and constants.

You could think of this as a bit like "switch" but on the other hand if your insight into switch is that it's basically a computed go-to wearing fancy dress then no, not that, the thing ordinary people use switch for.