Shell Programming and Scripting

1st String. Remove 1

$ ARR=( "Remove 1" "Remove 2" )
$ OLDIFS="$IFS"
$ IFS="|"
$ cat filter.awk

BEGIN {
        split(I,ARR,"|");
        P=1
}

P {
        for(N in ARR)
        if(match($0, ARR[N]))
        {
                print substr($0, 1, RSTART-1);
                E=N;
                P=0
        }
} P

(!P) && /Do not remove/ { P=1; }

$ cat data

1st String. Remove 1
Data
Data
2nd String
2nd String
1st String. Do not remove
Data
Data
2nd String
2nd String
1st String Remove 2
Data
Data
2nd String
2nd String

$ awk -v I="${ARR[*]}" -f filter.awk data

1st String.
Data
Data
2nd String
2nd String
1st String

$