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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script   src="https://code.jquery.com/jquery-1.12.3.min.js"   integrity="sha256-aaODHAgvwQW1bFOGXMeX+pC4PZIPsvn2h1sArYOhgXQ="   crossorigin="anonymous"></script>
</head>
<body>
<p class="danger-radius danger-radius_id_id-pole_124 hidden"></p>
<span></span>
</body>
</html>
 
//var pClassStr = $("p").attr("class")
                     // .match(/_id_/[a-zA-Z0-9]/+$)[1];
//console.log(pClassStr);
//;[0-9]+\?
var testStr = '"danger-radius danger-radius_id_idsfd-pogfle_124adad dasd';
var regExpWrapper = new RegExp('danger-radius_id_(.*?)(?: |$)', 'gim');
var result = regExpWrapper.exec(testStr);
console.log("res " + result[1]);
Output

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