i don't believe structured-queries are
simple basic-matches or that products
search is using structured-queries in
this instance.

one approximation might be:
bq=[mpn(text):"1942+-20"]&orderby=[x=mpn(text):if join(x)=="1942-20.5"
then 0 else fail()]

e.g.
http://tinyurl.com/nvmh2e
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