正規式:  /d(b+)(d)/i
<br>// 比對一個字元 d，後面接著一或多個 b，再接著一個 d
<br>// Remember matched b's and the following d
<br>// 忽略大小寫
<form name="f1" id="f1">
<p>
Enter your text to be tested:<br />
<input type="text" name="t2" id="t2" value = "cdbBdbsbz"><br />
<input type="button" name="go" value="Go!" onClick="check_it()">
</form>
<p>input: </p>
<p id="demo1"></p>
<p>output: </p>
<p id="demo2"></p>

<script>
var myRe = /d(b+)(d)/i;
function check_it()
{
    var intext= document.f1.t2.value;
var myArray = myRe.exec(intext);
let text = myArray.toString();
document.getElementById("demo1").innerHTML = myArray.input;
document.getElementById("demo2").innerHTML = text;
  }
</script>