jakarta regexp seems to be an obsolete piece of software. Please see more details in JBPAPP-3900. If anybody needs it, that can be added manually. Especially problematic is RPM distribution where there is a broken symlink [regexp].jar
David Knox <dknox> made a comment on jira JBPAPP-3900 regexp has been removed from the tomcat5 builds. The changes have been committed put won't be pushed until I have a chance to test the install.