​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 正则表达式</h1>
​
<p>找到换行符所在的位置：</p>
​
<p id="demo"></p>
​
<script>
let text = "Visit W3School.\nLearn JavaScript."; 
let pattern = /\n/;
let result = text.search(pattern);
​
document.getElementById("demo").innerHTML = result;
</script>
​
</body>
</html>
​