How to remove leading and trailing white spaces from a given html string?

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See the String method trim() – https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Trim

var myString = '  bunch    of <br> string data with<p>trailing</p> and leading space   ';
myString = myString.trim();
// or myString = String.trim(myString);

Edit

As noted in other comments, it is possible to use the regex approach. The trim method is effectively just an alias for a regex:

if(!String.prototype.trim) {  
  String.prototype.trim = function () {  
    return this.replace(/^\s+|\s+$/g,'');  
  };  
}

… this will inject the method into the native prototype for those browsers who are still swimming in the shallow end of the pool.

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