var reA = /[^a-zA-Z]/g;
            var reN = /[^0-9]/g;
                          
            someArray.sort(function(a,b) {
                if((a.attributes['data-user'].nodeValue !== null) && (b.attributes['data-user'].nodeValue !== null))
                {                   
                    var smlla = a.attributes['data-user'].nodeValue.toLowerCase();
                    var smllb = b.attributes['data-user'].nodeValue.toLowerCase();  
                
                    var aA = smlla.replace(reA, "");
                    var bA = smllb.replace(reA, "");
                    if(aA === bA) {
                        var aN = parseInt(a.attributes['data-user'].nodeValue.replace(reN, ""), 10);
                        var bN = parseInt(b.attributes['data-user'].nodeValue.replace(reN, ""), 10);
                        return aN === bN ? 0 : aN < bN ? 1 : -1;
                    } else {
                        return aA < bA ? 1 : -1;
                    }    
                }    
                else
                    return 0;           
            });