some content

$.fn.removeClassesByPattern = function(pattern) {
 var el = $(this);
 var items = [];
 var re = new RegExp(pattern); 
 $.each(el.attr('class').split(/s+/), function(index, item){
 if(re.test(item)){
 items.push(item);
 }
 });
 el.removeClass(items.join(' '));
 return el;
}

Использование:
$("#div1").removeClassesByPattern(/-find/);

$.fn.removeClassesByPattern2 = function(pattern) {
 var el = $(this);
 el.removeClass(function (index, _class) {
 var matches = _class.match (pattern) || []; 
 return (matches.join(' '));
 });
 return el;
}

Использование:
$("#div1").removeClassesByPattern2(/s?(w+-find)/);