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<!DOCTYPE html>
<html>
<body>
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<h2>JavaScript RegExp</h2>
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<p>exec() 方法测试（检索）字符串中的匹配项：</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 result = /e/.exec(text);
document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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