Find specific pattern and print complete text block using awk or sed

Question

How can find a specific number in a text block and print the complete text block beginning with the key word \"BEGIN\" and ending with \"

Answer 1

A bit lenghty but the RS-trick was already posted :-)

BEGIN {found=0;start=0;i=0}


/BEGIN/ {
    start=1
    delete a
}

/.*567.*/ {found=1}

{
    if (start==1) {
        a[i++]=$0
    }
}

/END/ {
    if (found) {
        for (i in a)
            print a[i]
    }
    found=0
    start=0
    delete a
}

Output:

$ awk -f s.awk input
BEGIN
A: xyz
B: 56789
C: abc
END
BEGIN
A: ghi
B: 56712
C: pqr
END