The output from bplist terminate each line with a null byte . This null byte is not direct visible on the console, but may show as a ^@. Also a od -c (UNIX tool) indicate each line is terminated with \0\n.
Some regular expression will not work correctly because of this extra non-visible character. Particular those commands that must match end of line (e.g file extensions).
To resolve the issue use sed to strip off the null byte:
/usr/openv/netbackup/bin/bplist -B -C $CLIENT -R -t 13 / | sed ‘s/\x0//g’
you can also use a perl one liner (much faster)
/usr/openv/netbackup/bin/bplist -B -C $CLIENT -R -t 13 / | perl -pe ‘s/\x0+$//’
Regular expression will now work as intended.