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If you are using Python already why don't you do it on it?

import re

string1 = re.compile('@')
string2 = re.compile('testtt')
with open("test.file") as f:
for line in f:
if...

Alternatively:

perl -ne '/testtt/ and print "$_$keep"; $keep=$_ if /@/' test.file
5 testtt 11223344
1 His email address alfredo@alfredo.ru
14 testtt 55667788
8 His...