How to fix RE error?

I have moved from ISO-8859-1 to UTF-8 and now when I start tin it's
complaining about an invalid character in the following RE :-

    strip_was_regex=.\(([Ww]a[rs]|[Bb]y[l³]o):.*\)\s*$

Do I need to rebuild tin in the new environment or what?

It's that '³' that's causing the problem I think, what should it
really be?...    Am I seeing Polish in that RE, searching for Bylo
with a line through the l?

-- 
Chris Green