G'day Jalcock501,

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): 

#!/usr/bin/env perl

use strict;
use warnings;

local $/ = "\nh";
print "Block $.\n", /^(E.*?)^G/ms ? $1 : "Error\n" while <DATA>;

__DATA__
hblah
Qblah
Eblock_1_line_1
Eblock_1_line_2
Gblah
hblah
Qblah
Gblah
hblah
Qblah
Eblock_3_line_1
Eblock_3_line_2
Gblah

[download]

Output:

Block 1
Eblock_1_line_1
Eblock_1_line_2
Block 2
Error
Block 3
Eblock_3_line_1
Eblock_3_line_2

[download]

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.

-- Ken

In reply to Re: Reading file and matching lines by kcott
in thread Reading file and matching lines by Jalcock501

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