Xapian supports a query syntax which uses a trailing '*', but it's not a true wildcard/regexp, it's a range search on an ordered index. Notmuch allows you to u

Xapian supports a query syntax which uses a trailing '*', but it's not a true wildcard/regexp, it's a range search on an ordered index. Notmuch allows you to use that syntax, see http://notmuchmail.org/searching/ http://notmuchmail.org/searching/