Re^3: Regex help needed

Huh, what are you talking about? Using strings as patterns is fine. Remember, this is Perl. If Perl expects a pattern somewhere, whatever you put there is a pattern. What you call an "undocumented" extension is nothing different from:

$foo = "3";
$bar = 4 + $foo;
[download]

or even:

my $pattern = "foo|bar";
say "Match" if $str =~ $pattern;
[download]

In my snippet, '%' is pattern by virtue of it being the first argument of split, not because of some "undocumented extension".

Note also this snippet from the split documentation:

As a special case, specifying a PATTERN of space (' ') will
split on white space just as "split" with no arguments does.

Note how the documentation talks about a pattern, while using quotes to delimit said pattern.

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Re^4: Regex help needed by choroba (Cardinal) on Apr 24, 2012 at 09:09 UTC
But be careful, `/ /` and `' '` are not the same thing for split: `use feature 'say'; my $x = "a\tb\tc"; say for split ' ', $x; say for split / /, $x;` [download]	[reply] [d/l] [select]
Re^4: Regex help needed by BillKSmith (Monsignor) on Apr 23, 2012 at 21:01 UTC
your example `my $pattern = "foo\|bar"; say "Match" if $str =~ $pattern;` [download] is very convincing. - Sorry about that.	[reply] [d/l]