block newletter type spam with long url

[Rajesh M.]

hi

we are getting spam with long url links to external websites. some times the links are hundreds of characters long.

few examples given below

is there any rule to block these ?

basically i need to block any url which contains several alphanumeric characters at the end.

http://xxxxx.com/uquote/b7e7c7f955d9af8c5ef=a5d66e_a4404d9
http://www.xxxx.us/l/lt1N2743MF255X/719V2211P5437V161


thank you,

rajesh