[anmatr]

Hello,
Hope this is not already answered - I've did some research but could not find any post.
How can I search in Calibre for series in a precise way so that only one series is found. Say I want to find any series with name "rm", and I have other series in the library with "Arm", "Harm" or "Firm". Currently I get books from all 4 series. But only want to see books from series "rm".

I've tried this:
series:rm
series:"rm"

But both result in books from all 4 series.

Thanks for any help on this.
anmatr