yum search
command provides a package listing with results of the search by pattern matching in the description, summary and package name. Let us see an example:
$ su -c "yum search imap" ... ================================ Matched: imap ================================= cyrus-imapd.x86_64 : A high-performance mail server with IMAP, POP3, NNTP and : SIEVE support cyrus-imapd-devel.i686 : Cyrus IMAP server development files cyrus-imapd-devel.x86_64 : Cyrus IMAP server development files cyrus-imapd-utils.x86_64 : Cyrus IMAP server administration utilities imapfilter.x86_64 : A flexible client side mail filtering utility for IMAP : servers imapsync.noarch : Tool to migrate email between IMAP servers ... ... ... squirrelmail.noarch : webmail client written in php stunnel.x86_64 : An SSL-encrypting socket wrapper tcpjunk.x86_64 : TCP protocols testing tool wammu.noarch : Mobile Phone Manager - Gammu GUI xfce4-mailwatch-plugin.x86_64 : Mail Watcher plugin for the Xfce panel zarafa.x86_64 : Open Source Edition of the Zarafa Collaboration Platform