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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 正则表达式</h1>
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<p>如果找到匹配项，则 test() 方法返回 true，否则返回 false。</p>
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<p>在字符串中搜索字符 "e"：</p>
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<p id="demo"></p>
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<script>
let text = "The best things in life are free";
let pattern = /e/;
let result = pattern.test(text);
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document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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