Re^3: Style question: regex versus string builtin function

A \Q does not "fill" an empty regex.

use Test::More 'tests' => 5;

ok( 'foo' =~ //,            'empty regex matches' );
ok( 'foo' =~ /foo/,         '/foo/ matches' );
ok( !('bar' =~ //),         'repeated match of foo' );
ok( !('bar' =~ /\Q/),       'repeated match with \\Q' );
my $empty = '';
ok( !('bar' =~ /\Q$empty/), 'interpolated empty string same as \\Q' );
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Re^4: Style question: regex versus string builtin function by throop (Chaplain) on Oct 02, 2007 at 15:24 UTC
Well, dang! I'd recommended using `index` because of (inter alia) some gnarly behavior with empty patterns. But it turns out it was even more gnarly than I thought. BTW, perlreref says `If 'pattern' is an empty string, the last I matched regex is used.` What is the 'I' in 'I matched'? I couldn't find it mentioned again in perlre or perlreref, and searching on 'I' turned out to be ... overproductive. throop	[reply]
Re^5: Style question: regex versus string builtin function by kyle (Abbot) on Oct 02, 2007 at 15:41 UTC
A bug in perlreref? On my screen, I see: `If ’pattern’ is an empty string, the last I<successfully> matched` [download] I know too little about POD to say whether this is a problem with the web rendering or a problem with how the file is written.	[reply] [d/l]