pattern for substitution including linefeed and carriage return

Hello!
I got an CSV file in which some items have more lines
and I want to delete them. This items have also textmarkers "
e.g.
30.11.2017;"Name";"Legend
for name
is not found";"New York";

How I remove such

"Legend
for name
is not found"

with wildcards focused only on linefeeds in such items.

Thank you Erhy

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