fix(router): handle slashes after regex quantifiers

[usualoma]

Route patterns such as /x/:prefix{a{2}/b}/x should match /x/aa/b/x, capturing aa/b as prefix.

Currently, pattern masking stops at the quantifier’s closing }, leaving the following / exposed to path splitting.

This is a fairly rare edge case, so I hesitated over whether it was worth adding code to support it. However, the routing syntax allows this pattern, so I’m opening this PR.

The author should do the following, if applicable

• Add tests
• Run tests
• pnpm run check:fix to format and lint the code

[github-actions]

Bundle size check

	main (552ea02)	#5552 (4ea316b)	+/-
Bundle Size (B)	18,335B	18,693B	+358B
Bundle Size (KB)	17.91K	18.25K	+0.34K

Compiler Diagnostics (tsc)

	main (552ea02)	#5552 (4ea316b)	+/-
Files	83	84	+1
Lines	59,446	59,530	+84
Identifiers	60,625	61,878	+1,253
Symbols	106,532	115,720	+9,188
Types	163,092	171,784	+8,692
Instantiations	414,023	452,803	+38,780
Memory used	208,711K	193,259K	-15,452K
I/O read	0.01s	0.01s	0s
I/O write	0s	0s	0s
Parse time	0.29s	0.22s	-0.07s
Bind time	0.1s	0.09s	-0.01s
Check time	1.25s	1.01s	-0.24s
Emit time	0s	0s	0s
Total time	1.65s	1.32s	-0.33s

Compiler Diagnostics (typescript-go)

	main (552ea02)	#5552 (4ea316b)	+/-
Files	215	216	+1
Lines	121,008	121,092	+84
Identifiers	107,353	108,609	+1,256
Symbols	181,164	189,748	+8,584
Types	262,348	271,038	+8,690
Instantiations	621,588	660,480	+38,892
Memory used	153,867K	158,591K	+4,724K
Memory allocs	1,781,675	1,851,858	+70,183
Config time	0.001s	0.001s	0s
BuildInfo read time	0.001s	0s	-0.001s
Parse time	0.086s	0.065s	-0.021s
Bind time	0s	0s	0s
Check time	0.459s	0.385s	-0.074s
Emit time	0.004s	0.003s	-0.001s
Changes compute time	0.021s	0.017s	-0.004s
Total time	0.601s	0.496s	-0.105s

---

Reported by octocov

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v5@b0d28c4). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v5    #5552   +/-   ##
=====================================
  Coverage      ?   79.93%           
=====================================
  Files         ?      131           
  Lines         ?    10151           
  Branches      ?     2237           
=====================================
  Hits          ?     8114           
  Misses        ?     2037           
  Partials      ?        0           

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[github-actions]

HTTP Performance Benchmark

Framework	Runtime	Average	Ping	Query	Body
hono (origin/main)	bun	77,093.06	99,154.50	73,868.29	58,256.38
hono (current)	bun	100,781.85	130,009.34	95,759.50	76,576.71
Change		+30.73%	+31.12%	+29.64%	+31.45%