diff --git a/waf.lua b/waf.lua
index 8ce05f4..17b4bee 100644
--- a/waf.lua
+++ b/waf.lua
@@ -42,7 +42,7 @@ elseif PostCheck then
 	   	        return true
     	    	end
 		size = size + len(data)
-		local m = ngxmatch(data,[[Content-Disposition: form-data;(.+)filename="(.+)\\.(.*)"]],'ijo')
+		local m = ngx.re.match(data,[[Content-Disposition: form-data;(.+)filename="(.+)\.(\w+)"]],'isjo')
         	if m then
             		fileExtCheck(m[3])
             		filetranslate = true