cat <<EOF | sed -e '/^7/d' | sed -e '/^\+1/d'  | sed -e '/^8888/d'  | sed -e 's/+8/8/' | grep '[\+7-8 ][- ( 0-9 )  ]\{4\}[- 0-9 ]\{7\}' 
84951234567
+74951234567
8-495-1-234-567
8 (8122) 56-56-56
8-911-1234567
8 (911) 12 345 67
8-911 12 345 67
+ 7 999 123 4567
8 999 123 4567
02
849512345
849512345678
8 (409) 123-123-123
7900123467
5005005001
8888-8888-88
84951a234567
8495123456a
+1 234 5678901
+8 234 5678901 
7 234 5678901 
EOF