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You can use wildcard with rpm search but you have to do 2 things:
1. use "-a" switch (means "all") with query ("-q") switch - argument is a pattern to use while searching for package names of all installed packages
2. protect wildcards, so that shell could not eat them - escape it with backslash ("\") or enclose all pattern between apostrophes ("'"):
rpm -qa 'co*de'
As you can see above it is possible to insert wildcards into middle of the pattern.
If you want, you can add "-i" or another rpm query options, "-i" will print package information for all installed packages matching pattern.
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