This AddOn will let you fix up your subject lines. For example if people forward emails they often have “fw:” at the beginning which doesn’t make for a very nice title.
You can specify “begins with” or “ends with” patterns.
“fw: *” is a “begins with” pattern. The AddOn will match a subject like “fw: New Stuff” and transform it into “New Stuff”
“*Newsletter” is a “ends with” pattern.
Note that you can have more than one pattern. They are processed in the same order you list them.