G'day penguin-attack,

Welcome to the monastery.

Firstly, your data description seems a little ambiguous: you say "end character" then describe <SOH> (5 chars), ^A (2 chars) and Ctrl-A (1 char). If, by <SOH>, you mean the ASCII character - that is the same character as Ctrl-A (i.e. the character with the ASCII value of 1).

Your main problem in your regexp is the use of a character class (i.e. [...]) - see Character Classes and other Special Escapes under perlre - Regular Expressions for details. You also don't need the 'g' modifier in either the match (m/.../) or the split function.

The following script does what I think you want (in terms of identifying the line endings). If not, please provide some sample data with expected output to remove the ambiguity I mentioned at the start. 

#!/usr/bin/env perl

use 5.010;
use strict;
use warnings;

my $soh_string = 'soh_string<SOH>';
my $caret_a_string = 'caret_a_string^A';
my $ctrl_a_string = 'ctrl_a_string' . chr(1);

my $test_string = join('',
    $soh_string, $caret_a_string, $ctrl_a_string,
    $caret_a_string, $ctrl_a_string, $soh_string,
    $ctrl_a_string, $soh_string, $caret_a_string
);

my $string_re = qr{(?><SOH>|\^A|\cA)};

say for split $string_re => $test_string;

[download]

Output:

$ pm_soh_split.pl
soh_string
caret_a_string
ctrl_a_string
caret_a_string
ctrl_a_string
soh_string
ctrl_a_string
soh_string
caret_a_string

[download]

-- Ken

In reply to Re: regex anchoring issue by kcott
in thread regex anchoring issue by penguin-attack

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