It is normally possible to search within the buffer's messages with the key combination
ctrl-r. How does one search for a message with a specific sender? For example, the messages sent by the nickname "fooBar".
press ctrl+r press tab and it will toggle threw the different search types
Search indicator ("~": case insensitive, "==": case sensitive, "str": search string, "regex": search regular expression, "msg": search in messages, "pre": search in prefixes, "pre|msg": search in prefixes and messages)