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https://github.com/vercel-labs/scriptc.git
synced 2026-10-23 06:10:02 +08:00
Chris Tate
3608a88602
- Share regex input preparation and bound capture storage to each result. - Batch replacement output and avoid rebuilding unchanged strings. - Accelerate case conversion and normalization while preserving Unicode and ownership behavior.
33 lines
1.6 KiB
TypeScript
33 lines
1.6 KiB
TypeScript
// Exercise shared regex input paths at word and prior short-subject boundaries.
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for (const length of [0, 1, 7, 8, 9, 255, 256, 257, 4096]) {
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for (const suffix of ["", "é", "😀", "\0"]) {
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const text = "a".repeat(length) + suffix + "b42";
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const pattern = /b(\d+)(x)?/g;
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const match = pattern.exec(text);
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console.log(length, suffix, match?.[0], match?.[1], match?.[2], pattern.lastIndex);
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console.log(pattern.test(text), pattern.lastIndex, text.search(/b\d+/));
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console.log(text.replace(/b(\d+)(x)?/g, "<$1:$2:$$:$&>"));
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console.log(text.replace(/z/g, "unmatched"), text.split(/(b)(\d+)(x)?/, 4));
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console.log(text.match(/\d+/g));
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for (const item of text.matchAll(/b(\d+)(x)?/g)) console.log(item.index, item[1], item[2]);
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}
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}
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// The executor needs more registers than the number of captures alone.
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const many = /(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)(m)(n)(o)(p)(q)(r)/g;
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console.log(JSON.stringify(many.exec("abcdefghijklmnopqr")), many.lastIndex);
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console.log("abcdefghijklmnopqr".replace(many, "$18-$1-$99"));
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console.log("xabcdefghijklmnopqry".split(many, 5));
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const sticky = /b/y;
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sticky.lastIndex = 200;
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console.log("abc".replace(sticky, "x"), sticky.lastIndex);
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sticky.lastIndex = 1;
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console.log("abc".replace(sticky, "long literal\0tail"), sticky.lastIndex);
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console.log("abc".replace(/b/, "a long literal prefix $1 unknown $ and trailing $"));
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console.log("abc".replace(/b/, "literal\0tail"));
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console.log("a\0b".replace(/\0/g, "[$&]"));
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console.log("ab".replace(/(?:)/gu, "-"), "😀b".replace(/(?:)/gu, "-"));
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console.log("ab".split(/(?:)/u), "😀b".split(/(?:)/u));
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console.log(/ſ/iu.test("s"), /K/iu.test("k"), /ſ/i.test("s"));
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