This search shows the problem.
| stats count | eval ips="2001:54FF:0000:ffff:ffff:ffff:ffff:ffff,2002:54FF:0000:ffff:ffff:ffff:ffff:ffff,2003:54FF:0000:ffff:ffff:ffff:ffff:ffff" | rex field=ips "(?P[^,]+)" max_match=0 | mvexpand ip | table ip | search ip=2001:54FF::/48
Splunk currently does not support ipv6 CIDR searching.
BUT, because you are searching for a /48, these both work:
| stats count | eval ips="2001:54FF:0000:ffff:ffff:ffff:ffff:ffff,2002:54FF:0000:ffff:ffff:ffff:ffff:ffff,2003:54FF:0000:ffff:ffff:ffff:ffff:ffff" | rex field=ips "(?P[^,]+)" max_match=0 | mvexpand ip | table ip | search ip=2001:54FF:*
| stats count | eval ips="2001:54ff:0000:ffff:ffff:ffff:ffff:ffff,2002:54FF:0000:ffff:ffff:ffff:ffff:ffff,2003:54FF:0000:ffff:ffff:ffff:ffff:ffff" | rex field=ips "(?P[^,]+)" max_match=0 | mvexpand ip | table ip | search ip=2001:54FF:*
As you can see, the capitalization does not matter.
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