/ Published in: jQuery
                    
                                        
                            
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if (! (extension && /^(jpg|png|jpeg|gif|zip|xls|xlsx|csv|txt|tif|tiff|pdf|doc|eps)$/.test(extension))){
// extension is not allowed
$("<span class='error'>Error: Not a valid file extension</span>").appendTo("#file_holder .files");
// cancel upload
return false;
}
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