svndumpfilter is part of any Subversion installation
svndumpfilter exclude
— Filter out nodes with given prefixes from the dump stream.
Beginning in Subversion 1.7, svndumpfilter can optionally treat the PATH_PREFIXs not merely as explicit substrings, but as file patterns instead.
$ svndumpfilter exclude --pattern "*.OLD" < dumpfile > filtered-dumpfile
Excluding prefix patterns:
'/*.OLD'