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const str = "Hello World, Hello JS"; str.match(/hello/gi); // ["Hello", "Hello"] str.search(/world/i); // 6 (index) str.replace(/hello/gi, "Hi"); // "Hi World, Hi JS" str.split(/,\s*/); // ["Hello World", "Hello JS"] /\d+/.test("abc123"); // true /\d+/.exec("abc123"); // ["123", index: 3, ...]
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