perf: use slice for proven ordered bounds

[Sheraff]

Summary

Replace 24 internal substring calls with shorter slice calls only where both bounds are proven non-negative and ordered.

The five extraction sites whose bounds can reverse remain substring; focused tests cover overlapping named, optional, and wildcard affixes plus Unicode lowercase expansion. No public API or browser-support floor changes.

Bundle impact

Measured from clean commit ae8b0397cf0a6813ea380fae4903371fd5d83ae5 against exact main base 697ebb6ddbd433d052b6b4707938a5c595865d58:

• all 17 scenarios improve total gzip by 2–23 bytes
• raw size improves by 84–88 bytes in every scenario
• one initial-gzip metric regresses by 3 bytes; mixed Brotli results are disclosed in the checked-in report
• no imports, helpers, exports, or tree-shaking boundaries change

A nearby indexOf → includes group was dropped after its isolated performance result was not confidently neutral.

Performance and validation

• direct ordered-bound benchmark: slice averages 10.34% faster than substring across four final runs
• real API benchmarks are flat to positive except a noisy search-prefix case with alternating paired direction
• router-core path suite: 361/361 passed with no type errors
• package unit, type, and lint validation passed for history, router-core, React Router, and Solid Router
• five independent semantic, compatibility, performance, tree-shaking, test, and measurement reviews approved the clean final diff

Full attribution, matrix, performance results, and rejected variants are in RESULT-optimization-shorter-string-operations.md.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e9a465b8-5741-4b21-83aa-30b0dee47c78

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[nx-cloud]

View your CI Pipeline Execution ↗ for commit ae8b039

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	❌ Failed	11m 29s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-06 07:36:41 UTC

[pkg-pr-new]

More templates

• tanstack-router-react-example-authenticated-routes
• tanstack-router-react-example-authenticated-routes-firebase
• tanstack-router-react-example-basic
• tanstack-router-react-example-basic-default-search-params
• tanstack-router-react-example-basic-devtools-panel
• tanstack-router-react-example-basic-file-based
• tanstack-router-react-example-basic-non-nested-devtools
• tanstack-router-react-example-react-query
• tanstack-router-react-example-basic-react-query-file-based
• tanstack-router-react-example-basic-ssr-file-based
• tanstack-router-react-example-basic-ssr-streaming-file-based
• tanstack-router-react-example-basic-virtual-file-based
• tanstack-router-react-example-basic-virtual-inside-file-based
• tanstack-router-react-example-deferred-data
• tanstack-router-i18n-paraglide
• tanstack-router-react-example-kitchen-sink
• tanstack-router-react-example-kitchen-sink-file-based
• tanstack-router-react-example-kitchen-sink-react-query
• tanstack-router-react-example-kitchen-sink-react-query-file-based
• tanstack-router-react-example-large-file-based
• tanstack-router-react-example-location-masking
• tanstack-router-react-example-navigation-blocking
• tanstack-router-react-example-quickstart
• tanstack-router-react-example-quickstart-esbuild-file-based
• tanstack-router-react-example-quickstart-file-based
• tanstack-router-react-example-quickstart-rspack-file-based
• tanstack-router-react-example-quickstart-webpack-file-based
• router-monorepo-react-query
• router-mono-simple
• router-mono-simple-lazy
• tanstack-router-react-example-scroll-restoration
• tanstack-search-validator-adapters
• tanstack-start-example-bare
• tanstack-start-example-basic
• tanstack-start-example-basic-auth
• tanstack-router-react-example-basic-authjs
• tanstack-start-example-basic-cloudflare
• tanstack-start-example-basic-react-query
• tanstack-start-example-basic-rsbuild
• tanstack-start-example-basic-static
• tanstack-start-bun-hosting
• tanstack-start-example-clerk-basic
• tanstack-start-example-convex-trellaux
• tanstack-start-example-counter
• tanstack-start-i18n-paraglide
• tanstack-start-example-large
• tanstack-start-example-material-ui
• tanstack-start-example-rscs
• tanstack-start-streaming-data-from-server-functions
• tanstack-start-example-supabase-basic
• tanstack-start-tailwind-v4
• tanstack-start-example-trellaux
• tanstack-start-example-workos
• tanstack-router-react-example-view-transitions
• tanstack-router-react-example-with-framer-motion
• tanstack-router-react-example-with-trpc
• tanstack-router-react-example-with-trpc-react-query
• tanstack-router-solid-example-authenticated-routes
• tanstack-router-solid-example-authenticated-routes-firebase
• tanstack-router-solid-example-basic
• tanstack-router-solid-example-basic-default-search-params
• tanstack-router-solid-example-basic-devtools-panel
• tanstack-router-solid-example-basic-file-based
• tanstack-router-solid-example-basic-non-nested-devtools
• tanstack-router-solid-example-basic-solid-query
• tanstack-router-solid-example-basic-solid-query-file-based
• tanstack-router-solid-example-basic-ssr-file-based
• tanstack-router-solid-example-basic-ssr-streaming-file-based
• tanstack-router-solid-example-basic-virtual-file-based
• tanstack-router-solid-example-basic-virtual-inside-file-based
• tanstack-router-solid-example-deferred-data
• tanstack-router-solid-i18n-paraglide
• tanstack-router-solid-example-kitchen-sink
• tanstack-router-solid-example-kitchen-sink-file-based
• tanstack-router-solid-example-kitchen-sink-solid-query
• tanstack-router-solid-example-kitchen-sink-solid-query-file-based
• tanstack-router-solid-example-large-file-based
• tanstack-router-solid-example-location-masking
• tanstack-router-solid-example-navigation-blocking
• tanstack-router-solid-example-quickstart
• tanstack-router-solid-example-quickstart-esbuild-file-based
• tanstack-router-solid-example-quickstart-file-based
• tanstack-router-solid-example-quickstart-rspack-file-based
• tanstack-router-solid-example-quickstart-webpack-file-based
• @tanstack/router-solid-mono-simple
• router-solid-mono-simple-lazy
• router-solid-monorepo-solid-query
• tanstack-router-solid-example-scroll-restoration
• tanstack-solid-router-search-validator-adapters
• tanstack-solid-start-example-basic
• tanstack-solid-start-example-basic-auth
• tanstack-solid-start-example-basic-authjs
• tanstack-solid-start-example-basic-cloudflare
• tanstack-solid-start-example-basic-netlify
• tanstack-solid-start-example-basic-nitro
• tanstack-start-example-basic-solid-query
• tanstack-solid-start-example-basic-static
• tanstack-solid-start-bun-hosting
• tanstack-solid-start-example-convex-better-auth
• tanstack-solid-start-example-counter
• tanstack-solid-start-i18n-paraglide
• tanstack-solid-start-example-large
• tanstack-solid-start-streaming-data-from-server-functions
• tanstack-solid-start-example-supabase-basic
• tanstack-solid-start-tailwind-v4
• tanstack-router-solid-example-view-transitions
• tanstack-router-solid-example-with-framer-motion
• tanstack-router-solid-example-with-trpc
• tanstack-router-vue-example-basic-jsx
• tanstack-router-vue-example-basic-file-based-jsx
• tanstack-router-vue-example-basic-file-based-sfc

@tanstack/arktype-adapter

npm i https://pkg.pr.new/@tanstack/arktype-adapter@7977

@tanstack/eslint-plugin-router

npm i https://pkg.pr.new/@tanstack/eslint-plugin-router@7977

@tanstack/eslint-plugin-start

npm i https://pkg.pr.new/@tanstack/eslint-plugin-start@7977

@tanstack/history

npm i https://pkg.pr.new/@tanstack/history@7977

@tanstack/nitro-v2-vite-plugin

npm i https://pkg.pr.new/@tanstack/nitro-v2-vite-plugin@7977

@tanstack/react-router

npm i https://pkg.pr.new/@tanstack/react-router@7977

@tanstack/react-router-devtools

npm i https://pkg.pr.new/@tanstack/react-router-devtools@7977

@tanstack/react-router-ssr-query

npm i https://pkg.pr.new/@tanstack/react-router-ssr-query@7977

@tanstack/react-start

npm i https://pkg.pr.new/@tanstack/react-start@7977

@tanstack/react-start-client

npm i https://pkg.pr.new/@tanstack/react-start-client@7977

@tanstack/react-start-rsc

npm i https://pkg.pr.new/@tanstack/react-start-rsc@7977

@tanstack/react-start-server

npm i https://pkg.pr.new/@tanstack/react-start-server@7977

@tanstack/router-cli

npm i https://pkg.pr.new/@tanstack/router-cli@7977

@tanstack/router-core

npm i https://pkg.pr.new/@tanstack/router-core@7977

@tanstack/router-devtools

npm i https://pkg.pr.new/@tanstack/router-devtools@7977

@tanstack/router-devtools-core

npm i https://pkg.pr.new/@tanstack/router-devtools-core@7977

@tanstack/router-generator

npm i https://pkg.pr.new/@tanstack/router-generator@7977

@tanstack/router-plugin

npm i https://pkg.pr.new/@tanstack/router-plugin@7977

@tanstack/router-ssr-query-core

npm i https://pkg.pr.new/@tanstack/router-ssr-query-core@7977

@tanstack/router-utils

npm i https://pkg.pr.new/@tanstack/router-utils@7977

@tanstack/router-vite-plugin

npm i https://pkg.pr.new/@tanstack/router-vite-plugin@7977

@tanstack/solid-router

npm i https://pkg.pr.new/@tanstack/solid-router@7977

@tanstack/solid-router-devtools

npm i https://pkg.pr.new/@tanstack/solid-router-devtools@7977

@tanstack/solid-router-ssr-query

npm i https://pkg.pr.new/@tanstack/solid-router-ssr-query@7977

@tanstack/solid-start

npm i https://pkg.pr.new/@tanstack/solid-start@7977

@tanstack/solid-start-client

npm i https://pkg.pr.new/@tanstack/solid-start-client@7977

@tanstack/solid-start-server

npm i https://pkg.pr.new/@tanstack/solid-start-server@7977

@tanstack/start-client-core

npm i https://pkg.pr.new/@tanstack/start-client-core@7977

@tanstack/start-fn-stubs

npm i https://pkg.pr.new/@tanstack/start-fn-stubs@7977

@tanstack/start-plugin-core

npm i https://pkg.pr.new/@tanstack/start-plugin-core@7977

@tanstack/start-server-core

npm i https://pkg.pr.new/@tanstack/start-server-core@7977

@tanstack/start-static-server-functions

npm i https://pkg.pr.new/@tanstack/start-static-server-functions@7977

@tanstack/start-storage-context

npm i https://pkg.pr.new/@tanstack/start-storage-context@7977

@tanstack/valibot-adapter

npm i https://pkg.pr.new/@tanstack/valibot-adapter@7977

@tanstack/virtual-file-routes

npm i https://pkg.pr.new/@tanstack/virtual-file-routes@7977

@tanstack/vue-router

npm i https://pkg.pr.new/@tanstack/vue-router@7977

@tanstack/vue-router-devtools

npm i https://pkg.pr.new/@tanstack/vue-router-devtools@7977

@tanstack/vue-router-ssr-query

npm i https://pkg.pr.new/@tanstack/vue-router-ssr-query@7977

@tanstack/vue-start

npm i https://pkg.pr.new/@tanstack/vue-start@7977

@tanstack/vue-start-client

npm i https://pkg.pr.new/@tanstack/vue-start-client@7977

@tanstack/vue-start-server

npm i https://pkg.pr.new/@tanstack/vue-start-server@7977

@tanstack/zod-adapter

npm i https://pkg.pr.new/@tanstack/zod-adapter@7977

commit: ae8b039

[github-actions]

Bundle Size Benchmarks

• Commit: d17f90f9165b
• Measured at: 2026-08-06T03:10:54.367Z
• Baseline source: history:697ebb6ddbd4
• Dashboard: bundle-size history

The following scenarios have bundle-size changes compared with the baseline:

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	87.10 KiB	-12 B (-0.01%)	86.96 KiB	269.05 KiB	75.81 KiB	████▂▂▂▂▂▁▂▁
react-router.full	90.89 KiB	-7 B (-0.01%)	90.75 KiB	281.00 KiB	79.07 KiB	████▂▂▂▂▂▁▂▂
solid-router.minimal	34.79 KiB	-11 B (-0.03%)	34.66 KiB	99.88 KiB	31.41 KiB	████▂▂▂▂▂▁▁▁
solid-router.full	39.90 KiB	-2 B (-0.00%)	39.77 KiB	115.06 KiB	35.91 KiB	████▂▂▂▂▂▁▁▁
vue-router.minimal	52.09 KiB	-8 B (-0.01%)	51.96 KiB	143.04 KiB	46.86 KiB	████▁▁▁▁▁▁▁▁
vue-router.full	58.04 KiB	-8 B (-0.01%)	57.91 KiB	161.71 KiB	52.07 KiB	████▁▁▁▁▁▁▁▁
react-start.minimal	100.58 KiB	-14 B (-0.01%)	100.45 KiB	312.20 KiB	87.30 KiB	███████▁▁▁▁▁
react-start.deferred-hydration	101.32 KiB	-14 B (-0.01%)	100.47 KiB	313.57 KiB	88.13 KiB	███████▁▁▁▁▁
react-start.full	103.92 KiB	-2 B (-0.00%)	103.78 KiB	322.15 KiB	90.23 KiB	███████▁▁▁▁▁
react-start.rsbuild.minimal	100.22 KiB	-13 B (-0.01%)	100.05 KiB	316.70 KiB	86.40 KiB	▁▁▁▁▂▂▂█████
react-start.rsbuild.minimal-iife	100.63 KiB	-13 B (-0.01%)	100.47 KiB	317.63 KiB	86.78 KiB	▁▁▁▁▂▂▂█████
react-start.rsbuild.full	103.56 KiB	-12 B (-0.01%)	103.39 KiB	326.79 KiB	89.21 KiB	▁▁▁▁▃▃▃█████
solid-start.minimal	48.17 KiB	-12 B (-0.02%)	48.04 KiB	142.02 KiB	42.80 KiB	███████▁▁▁▁▁
solid-start.deferred-hydration	51.43 KiB	-10 B (-0.02%)	48.10 KiB	150.06 KiB	45.85 KiB	███████▁▁▁▁▁
solid-start.full	53.42 KiB	-17 B (-0.03%)	53.29 KiB	157.75 KiB	47.28 KiB	████▆▆▆▁▁▁▁▁
vue-start.minimal	68.95 KiB	-23 B (-0.03%)	68.82 KiB	195.03 KiB	61.28 KiB	████▆▆▆▁▁▁▁▁
vue-start.full	72.92 KiB	-8 B (-0.01%)	72.79 KiB	207.53 KiB	64.74 KiB	████▆▆▆▁▁▁▁▁

Current gzip tracks all emitted client JS chunks. Initial gzip tracks only the entry/import graph. Trend sparkline is historical current gzip ending with this PR measurement; lower is better.

[github-actions]

🚀 Changeset Version Preview

5 package(s) bumped directly, 18 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.20 → 1.170.21	Changeset
@tanstack/router-core	1.171.17 → 1.171.18	Changeset
@tanstack/solid-router	1.170.20 → 1.170.21	Changeset
@tanstack/start-server-core	1.169.20 → 1.169.21	Changeset
@tanstack/vue-router	1.170.19 → 1.170.20	Changeset
@tanstack/react-start	1.168.37 → 1.168.38	Dependent
@tanstack/react-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/react-start-rsc	0.1.36 → 0.1.37	Dependent
@tanstack/react-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/router-cli	1.167.23 → 1.167.24	Dependent
@tanstack/router-generator	1.167.23 → 1.167.24	Dependent
@tanstack/router-plugin	1.168.25 → 1.168.26	Dependent
@tanstack/router-vite-plugin	1.167.25 → 1.167.26	Dependent
@tanstack/solid-start	1.168.36 → 1.168.37	Dependent
@tanstack/solid-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/solid-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/start-client-core	1.170.16 → 1.170.17	Dependent
@tanstack/start-plugin-core	1.171.28 → 1.171.29	Dependent
@tanstack/start-static-server-functions	1.167.21 → 1.167.22	Dependent
@tanstack/start-storage-context	1.167.19 → 1.167.20	Dependent
@tanstack/vue-start	1.168.35 → 1.168.36	Dependent
@tanstack/vue-start-client	1.167.21 → 1.167.22	Dependent
@tanstack/vue-start-server	1.167.25 → 1.167.26	Dependent

[codspeed-hq]

Merging this PR will regress 6 benchmarks

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 6 improved benchmarks
❌ 6 regressed benchmarks
✅ 168 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	mem server request-churn (solid)	425.2 KB	2,908.5 KB	-85.38%
❌	Memory	mem server error-paths redirect (vue)	338.6 KB	524.8 KB	-35.48%
❌	Memory	mem client unique-location-churn (solid)	341.2 KB	455.5 KB	-25.08%
❌	Memory	mem server error-paths unmatched (react)	317.5 KB	356.9 KB	-11.04%
❌	Memory	mem client unique-location-churn (react)	665 KB	718.9 KB	-7.5%
❌	Memory	mem client navigation-churn (solid)	580.3 KB	619.9 KB	-6.4%
⚡	Memory	mem server server-fn-churn (vue)	4,147.3 KB	270.5 KB	×15
⚡	Memory	mem server error-paths unmatched (vue)	2,142.1 KB	479.1 KB	×4.5
⚡	Memory	mem server peak-large-page (react)	1,737.5 KB	953.7 KB	+82.19%
⚡	Memory	mem server error-paths redirect (solid)	388 KB	278.6 KB	+39.29%
⚡	Memory	mem client navigation-churn (vue)	1.3 MB	1.2 MB	+3.9%
⚡	Simulation	ssr control-flow unmatched 404 (react)	58.1 ms	56.1 ms	+3.59%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing codex/shorter-string-operations (ae8b039) with main (697ebb6)}

[nx-cloud]

Nx Cloud has identified a possible root cause for your failed CI:

We classified this failure as an environment issue unrelated to the PR. The error originates in a stale e2e-utils dist artifact missing the toRuntimePath export — a build environment problem entirely outside the scope of the substring → slice optimization changes in @tanstack/router-core. No changes to this PR are needed to resolve it.

No code changes were suggested for this issue.

Trigger a rerun:

View detailed reasoning on Nx Cloud ↗

_{🎓 Learn more about Self-Healing CI on nx.dev}