Move regex to feature

[CathalMullan]

Not sure how to handle benchmarks/CI for multiple features.

Also, magic cache is causing issues with rate-limiting to often for my liking.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #56 will degrade performances by 2.25%

_{Comparing 55-move-regex-support-to-an-optional-feature (61923a4) with main (d0f3b01)}

Summary

⚡ 2 improvements ❌ 1 (👁 1) regressions ✅ 17 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	55-move-regex-support-to-an-optional-feature	Change
👁	path-tree	7.8 µs	8 µs	-2.25%
⚡	wayfind	7.7 µs	7.3 µs	+4.8%
⚡	wayfind	44.8 µs	43.4 µs	+3.29%