(info "(mailutils) Specifying Messages") says
Header match
The "header match" is a string in the form:
[HEADER:]/STRING/
It selects all messages that contain header field HEADER matching
given REGEXP. If the variable 'regexp' is set, the STRING is
assumed to be a POSIX regexp. Otherwise, a header is considered to
match STRING if the latter constitutes a substring of the former
(comparison is case-insensitive).
Maybe instead say
Header match
The "header match" is a string in the form:
[HEADER:]/STRING/
It selects all messages that contain header field HEADER matching
given **STRING**. If the variable 'regexp' is set, the STRING is
assumed to be a POSIX regexp. (All comparison is
case-insensitive in either case).
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