Julian Foad wrote:
[[[ $ svndumpfilter --help exclude [...] --pattern : Treat the path prefixes as file glob patterns. ]]]
I expanded the help a little in revision 1783741, to include what I felt are the most useful brief details:
[[[ $ svndumpfilter --help exclude [...] --pattern : Treat the path prefixes as file glob patterns. Glob special characters are '*' '?' '[]' and '\'. Character '/' is not treated specially, so pattern /*/foo matches paths /a/foo and /a/b/foo. ]]] - Julian