The following command is working as expected.
# some command | awk \'/(\\<^create\\>|\\<^alter\\>|\\<^drop\\>)/,/;/\' create table todel1
Add IGNORECASE = 1; to the beginning of your awk command like so:
IGNORECASE = 1;
bash-3.2$ echo "Create" | awk '/^create/;' bash-3.2$ echo "Create" | awk 'IGNORECASE = 1;/^create/;' Create