On (info "(mailutils) Mail Variables")
'regex'
Type: Boolean.
Default: True.
Setting this to 'True' enables use of regular expressions in
'/.../' message specifications.
But on (info "(mailutils) Specifying Messages")
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
^^^^^^
regex or regexp... apparently "regex" is the real variable, and regexp
is a typo.
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