SUBJECTARTICLERXP defines the Perl regular expression matching leading articles (eg: "the", "a", "an") in subject text.
SUBJECTARTICLERXP is used by MHonArc for sorting. The regex defined is used in s/// operation with the case-insensitive modifier. The regex should be anchored to the beginning of the string.
The SUBJECTARTICLERXP is normally changed to suit a particular locale.
If you are archiving French message, the following setting maybe appropriate:
<SubjectArticleRxp> ^l(es|e|a)\s+ </SubjectArticleRxp>