Here's another approach that avoids look-arounds.
Win8 Strawberry 5.30.3.1 (64) Thu 04/14/2022 15:59:05
C:\@Work\Perl\monks
>perl
use strict;
use warnings;
use Data::Dump qw(dd);
my $rx_ab = qr{ A \s* = \s* [BCDEFGH] }xms;
my $rx_stop = qr{ batch \s* = }xms;
my @strings = (
'A = B foo A=C batch = bar A = D',
'A = B foo A=C bar A =D',
);
for my $s (@strings) {
my @captures = $s =~ m{
($rx_ab) | $rx_stop (*COMMIT) (*FAIL) # wrong order? see upd
+ate below.
}xmsg;
dd \@captures;
}
^Z
["A = B", "A=C"]
["A = B", "A=C", "A =D"]
You will have to elaborate the $rx_ab and $rx_stop regexes until they match what you want.
I think the | The (*COMMIT) special backtracking control verb is available from Perl version 5.10 onward
(update: and is non-experimental from version 5.20 on).
Update: Because of the way Perl ordered alternations work, it seems to me that the order of the alternation used above should be
$rx_stop (*COMMIT) (*FAIL) | ($rx_ab)
This eliminates the possibility that the A pattern can accidentally match the 'batch' stop marker.
Give a man a fish: <%-{-{-{-<
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