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Using awk:

awk '/^STAC$/,/$ /' input

This will print all lines between STAC and anything (including the matching lines)

Using awk:

awk '/^STAC$/,/$ /' input

This will print all lines between STAC and anything (including the matching lines)

Or using a grep that supports the -z option (BSD grep does not):

Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline.

grep -z 'STAC' input

Using GNU awk:

awk '/^STAC$/,/$^/' input

This will print all lines between STAC and anything (including the matching lines)

Using awk:

awk '/^STAC$/,/$ /' input

This will print all lines between STAC and anything (including the matching lines)

Using GNU awk:

awk '/^STAC$/,/\[^\]*/' input

This will print all lines between STAC and anything (including the matching lines)

Using GNU awk:

awk '/^STAC$/,/$^/' input

This will print all lines between STAC and anything (including the matching lines)