echo 'example:[123; 0.000; ""; "-"] example2:[456; 0.000; "";"-"] example3:[1hfgh; 0.000; ""; "-"] example:[123; 0.000; ""; "-"] example3:[2222; 0.000; ""; "-"]' \
| awk 'BEGIN{RS="]"} {print}' | grep example3 | grep -o '\[.*' | sed 's/\[//'
1hfgh; 0.000; ""; "-"
2222; 0.000; ""; "-"