Java EE (Java Enterprise Edition) General Discussion

hi,
could any tell me the is web.xml accepts regexp(except wild card) in it's url-pattern attribute. I want to put regular expression (except wildcard, i know it supports) as [a-zA-Z]+ like in url-pattern in servlet-mapping. I tried this :
<servlet-mapping>
<servlet-name>AppDnldMain</servlet-name>
<url-pattern>/[a-zA-Z]+/?</url-pattern>
</servlet-mapping>

But it dint work.. I dont know whether i processed in right way. Any suggestion are most welcome..