[mod-security-users] Filter question

[Gerwin K. -|- D. W. <ge...@di...>]

Hello guys,

I want the following filter but i can't figger it out exactly.
I want to check ARGS if there is http:// in it AND .txt OR.jpg OR .gif.
so it should match on all: 
id=http://www.ddddd.br/dc.jpg
id=http://www.ddddd.br/dc.txt
id=http://www.ddddd.br/dc.jpg

What should be the filter code to use?

Gerwin