OK, I had a problem here when converting bio2rdf.org irefindex data into nanopublication using sparql here: 

in a database, if the item you are looking for has multiple types, but you only need one of those types in your converted data, what you can do is to use a sparql filter function with regex

1. the proper sparql filter syntax is as follows: 

select ?s where{  ?s ?p ?o .  filter ( #your statements here for filter ) #it‘s brackets () not curly parenthesis {} }

2. the proper regex to match those items that you don‘t want 

^.*?(?<!Resource)$ # the regex filter regex(?interaction_type, "^.*?(?<!Resource)$", "i") # how do you use the regex in the filter

^.*?(?<!Resource)$ means that you are finding stuff that not ending with "Resource" - references: http://www.cnblogs.com/wangqiguo/archive/2012/05/08/2486548.html 
2.例子，查找不以com结尾的字符串。
   www.sina.com.cn
   www.educ.org
   www.hao.cc
   www.baidu.com
   www.123.com正则 
   ^.*?(?<!com)$  匹配前3行结果。如果查找以com结尾的字符串则使用正则 ^.*?(?<=com)$或者 ^.*?com$  
and the syntax of filter can be referred here: http://www.w3.org/TR/rdf-sparql-query/ , you can search "11.4.13 regex" to get there. 

online regex tester is also very helpful when debugging your regex: https://regex101.com/

Regular Expression "not matching" and SPARQL Filter function usage