Regex For Left Trim On String

function LeftTrim(LeftTrim_String)
{
	var RegExobj = /^(\s*)(\b[\w\W]*)$/;
	if(RegExpobj.test(LeftTrim))
	{
       		//remove leading a whitespace characters From "LeftTrim"
       		LeftTrim = LeftTrim_String.replace(RegExobj, '$2');
    	}
	return LeftTrim;
}