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bench_regex.cjs
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bench_regex.cjs
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const now = () =>
typeof performance !== 'undefined' && performance && typeof performance.now === 'function'
? performance.now()
: Date.now();
function bench(name, rounds, fn) {
fn();
const start = now();
let result;
for (let i = 0; i < rounds; i++) result = fn();
const elapsed = now() - start;
console.log(
`${name}: ${elapsed.toFixed(2)}ms total, ${(elapsed / rounds).toFixed(4)}ms/round`
);
return result;
}
const routeCorpus = new Array(2000)
.fill(0)
.map((_, i) => `/api/v1/users/${i}/posts/${i % 17}?limit=50&offset=${i}`)
.join('\n');
const unicodeCorpus = new Array(2500)
.fill('alpha beta gamma delta user_123 route_456 JSON42 token99')
.join(' ');
const routeSource =
'^/api/v(?<version>[0-9]+)/users/(?<user>[0-9]+)/posts/(?<post>[0-9]+)(?:\\?(?<query>.*))?$';
const routeRe = new RegExp(routeSource, 'gm');
const tokenRe = /\b[a-z_]+[0-9]*\b/g;
const splitRe = /[A-Za-z_][A-Za-z0-9_]{0,31}/g;
console.log('=== Regex Benchmark ===');
console.log(`route corpus bytes: ${routeCorpus.length}`);
console.log(`unicode corpus bytes: ${unicodeCorpus.length}`);
console.log('');
bench('compile route regexp x5000', 5000, () => new RegExp(routeSource, 'gm'));
bench('route matches x400', 400, () => {
routeRe.lastIndex = 0;
let count = 0;
while (routeRe.exec(routeCorpus)) count++;
return count;
});
bench('token scan x500', 500, () => {
tokenRe.lastIndex = 0;
let count = 0;
while (tokenRe.exec(unicodeCorpus)) count++;
return count;
});
bench('identifier split x500', 500, () => {
splitRe.lastIndex = 0;
let count = 0;
while (splitRe.exec(unicodeCorpus)) count++;
return count;
});

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bench_regex.cjs (1 KB)

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