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@@ -0,0 +1,46 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+<body>
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+ <script>
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+ // const reg = /a*$/;
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+ // console.log(reg.test("aa"));
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+ // console.log(reg.test(" "));
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+ // console.log(reg.test("aab"));
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+
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+ // const reg = /a+$/;
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+ // console.log(reg.test("aa"));
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+ // console.log(reg.test(" "));
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+ // console.log(reg.test("aab"));
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+
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+ // const reg = /a?a$/;
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+ // console.log(reg.test("aa"));
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+ // console.log(reg.test("a"));
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+ // console.log(reg.test(" "));
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+ // console.log(reg.test("aab"));
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+
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+ // const reg = /a{2}$/;
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+ // console.log(reg.test("aa"));
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+ // console.log(reg.test("a"));
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+ // console.log(reg.test(" "));
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+ // console.log(reg.test("aab"));
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+
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+ // const reg = /a{1,}$/;
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+ // console.log(reg.test("aa"));
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+ // console.log(reg.test("a"));
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+ // console.log(reg.test(" "));
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+ // console.log(reg.test("aab"));
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+
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+
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+ const reg = /a{0,2}$/;
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+ console.log(reg.test("aa"));
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+ console.log(reg.test("a"));
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+ console.log(reg.test(" "));
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+ console.log(reg.test("aab"));
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+ </script>
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+</body>
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+</html>
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zheng
