Strip all non-numeric characters from string in JavaScript -

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Consider a non-dom scenario where you want to remove all non-numeric characters from the string using javascript / ECMAScript . Any characters that are in the range of 0-9 should be kept. 

  var myString = 'abc123.8 & lt; Blah & gt; '; // The desired output is 1238

How do you get it in plain JavaScript? Please remember this is a non-DOM scenario, so jQuery and other solutions that include browser and keypress events are not appropriate. Use the string method with a regex of

\ D Which is a miniature character square that matches all non-digits: 

  myString = myString.replace (/ \ D / g, '');

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