This causes the dfa engine to not strip trailing /
and to handle /*/ /**/ and /* and /** cases specially so that directories
don't get matched unintentionally
aare pcre
/foo/* -> /foo/[^/][^/]* so the dir /foo/ will not match the rule
/foo/** -> /foo/[^/].*
/*/foo -> /[^/][^/]*/foo so the rule won't match //foo
/**/foo -> /[^/].*/foo
rules that contain more than a * or ** between dir / elements do not
get converted, ie.
/foo*
/foo**
/foo*/
/foo**/
/*foo
/**foo
/*foo/
/**foo/
there is a known case where this patch is incomplete. When there
exists an alternation that can be empty and * or ** ie.
/{foo,}*
/{foo,*}
