Thanks, unfortunately it does not work, or only if I use {2} instead of {2,}. However, it then unfortunately also deletes the blank line in cases like this (P for paragraph):
"blablablaP
P
blablabla"
becomes


"blablabla
blablalba"

Moreover, it does not delete the line here between two lines:

last table row table 1
empty line
empty line
first table row table 2