[gr8man]

Description
In Router::checkRoutes(), every registered route was unconditionally evaluated with preg_match('#^' . $routeKey . '$#u', $uri, $matches). In applications with dozens or hundreds of routes, matching routes located later in the table (or handling 404s) incurs significant PCRE overhead.

This PR adds a fast-path for static routes:

• Uses strpbrk($routeKey, "()[]?*+{}^$\.|#") to detect PCRE metacharacters (including the pattern delimiter #).
• If no metacharacters are present, directly compares $routeKey !== $uri and skips PCRE execution.
• If $routeKey === $uri, initializes $matches = [$uri] and proceeds directly to dispatch.
• Strictly preserves route definition order and evaluation precedence (dynamic routes registered before matching static patterns retain priority).
• Preserves all existing behavior for Closures, controllers, parameters, redirects, and locales with zero BC breaks.

Benchmark (10,000 iterations per scenario)

• 100 routes (mixed table, match at position 100): ~46.8% latency reduction (1.88x speedup)
• 100 routes (purely static, match at position 100): ~44.3% latency reduction (1.80x speedup)
• 100 routes (match at position 1): ~35.2% latency reduction (1.54x speedup)

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[Copilot]

🟡 Changes recommended

Strict equality skips previously matching routes for URIs ending in an allowed newline, potentially sending requests to a catch-all or 404; preserve regex handling for this case and add a regression test.

1 open issue

• Preserve route matching for URIs ending in a newline · New

What changed in this PR

Optimizes CodeIgniter’s route matching by bypassing regular expressions for static route keys while retaining ordered route evaluation.

Changes:

• Adds direct string comparison for routes without regex metacharacters.
• Keeps shared dispatch logic for static and dynamic matches.
• Adds tests for controllers, closures, numeric keys, additional segments, and dynamic-route precedence.

Assumed target: develop, since no base branch is specified. Validation used focused code inspection; automated tests remain for CI.

File	Description
tests/​system/​Router/​RouterTest.php	Adds static-route matching and precedence tests.
system/​Router/​Router.php	Introduces the static-route fast path and shared dispatch flow.

_{Review effort: Balanced}