On Windows, when you print "\n", there will be 2 characters, 0x0D 0x0A. ... I had thought that "\n" and "\n" had the same meaning whether write or read. It turns out that is NOT true.

As I've said several times now, to be completely accurate (which is important here), on Windows and *NIX, the Perl string "\n" means "\x0A" (I think Perl could be complied differently, but I'm not aware of any current builds that actually do this). What gets written or read depends on which PerlIO layers are in effect. This can even be changed dynamically while a handle is open using binmode, and it works the same on *NIX and Windows, except that :crlf is one of the defaults on Windows. To check which layers are in fact in effect, use my @layers = PerlIO::get_layers($handle);

On Windows this will print <CR><CR><LF>. When read back via text mode, only one <CR> will be deleted. The regex fails because there is still another <CR> there and "$" is looking for a 0x0A. Correct?

Correct, yes - I would nitpick that in the examples I showed, there is no reading/writing going on, so there is no need to think about what translations might be happening. Once a string has been read into Perl (and its contents verified with a dumper module), regexes behave the same on both platforms, which is where this subthread started.

Update: Also, note that "text mode" is somewhat misleading: technically, there is just the :crlf layer, which can either be active or not. Again, see PerlIO (and binmode).

In reply to Re^11: How do I display only matches (updated) by haukex
in thread (SOLVED) How do I display only matches by tem2

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