On Jul 21, 6:06 pm, shawnhco...@gmail.com (Shawn H Corey) wrote:
> On 11-07-21 08:54 PM, Rob Dixon wrote:
> ...
> I think part of the confusion is also in what does $ match? According
> to perlre, under "Regular Expressions",
>
> $ Match the end of the line (or before newline at the end)
>
> That means it can match the end of the string or a newline at the end of
> the string.
>
> Try this and see what it prints:
>
> #!/usr/bin/env perl
>
> use strict;
> use warnings;
>
> while( <> ){
> print if /(\w+)$/}
>
> __END__
>
Just entering a 'return' which will put a newline in
$_ won't print if the target regex is /(\w+)+$/.
Only [a-zA-Z_0-9] --or potentially more with
certain locale settings-- will. But not a newline
in any case.
Even /(.+)$/ won't match a single newline at the
end unless the regex '/s' modifier is used:
perl -E "$_ = qq{\n}; say qq{matched\n} if /(.)$/" <-- no
perl -E "$_ = qq{\n}; say qq{matched\n} if /(.)$/s" <---yes
--
Charles DeRykus
--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
