JIRA dies with:

[8/20/05 11:47:15:051 BST] 2d74eab4 WebGroup E SRVE0026E: [Servlet Error]-[Filter [UrlRewriteFilter]: filter is unavailable.]: java.lang.NoSuchMethodError: org.apache.oro.text.regex.Util: method substitute(Ljava/lang/StringBuffer;Lorg/apache/oro/text/regex/PatternMatcher;Lorg/apache/oro/text/regex/Pattern;Lorg/apache/oro/text/regex/Substitution;Ljava/lang/String;I)I not found
at org.tuckey.web.filters.urlrewrite.RuleBase.executeBase(RuleBase.java:126)
at org.tuckey.web.filters.urlrewrite.Rule.execute(Rule.java:84)

Websphere has oro hidden inside its jython jar.....
Websphere is a PITA!!!

The old version of oro doesnt support this call

Util.substitute(toUrl, matcher, pattern, substitution, url, 1)