代码示例:(标识:eg_js_regexp_test)
<!DOCTYPE html>
<html>
<body>

<h2>JavaScript 正则表达式</h2>

<p>检索下面段落中的一个 "e":</p>

<p id="p01">The best things in life are free!</p>

<p id="demo"></p>

<script>
text = document.getElementById("p01").innerHTML; 
document.getElementById("demo").innerHTML = /e/.test(text);
</script>

</body>
</html>
运行结果: