| stands for "or" only inside a regular expression. Outside, you have to use || or or. The vertical bar alone is a "bitwise or", see perlop. No "or" is needed, though:
#!/usr/bin/perl
use warnings;
use strict;
use Test::More;
my $r = qr/^-? # Can start with a minus.
(:? # Non capturing group.
[0-9]+ # Digits. Does not match Unicode digits as \d
+ does.
(?: # Another group, this one will be optional.
\. # The dot. Backslashed to lose its special me
+aning.
[0-9]+ # Digits again.
)? # End of the inner group, the ? makes it opti
+onal.
) # End of the outer group.
$ # And nothing more.
/x;
like ($_, $r) for qw/ 4 -7 0.656 -67.35555 /;
unlike($_, $r) for qw/ 5. 56F .32 -.04 /;
done_testing();
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|
