You asked a very similar question, with a very similar title, using very similar data, in "Search file for certain lines".
Here's a cutdown version (with appropriate modifications) of the technique I provided in that thread (Re: Search file for certain lines):
local $/ = "\nh";
print "Block $.\n", /^(E.*?)^G/ms ? $1 : "Error\n" while <DATA>;
In Re: Search file for certain lines, I provided an explanation of the code as well as links to more detailed documentation.
I've introduced no new concepts here: if there's something you don't understand here, go back to the earlier post for more information.
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