ID: 49198
User updated by: inf3rno dot hu at gmail dot com
Reported By: inf3rno dot hu at gmail dot com
Status: Bogus
Bug Type: PCRE related
Operating System: *
PHP Version: 5.2.10
New Comment:
I don't agree. How do you explain the same behaviour with the .*$
pattern?
I think .* have to return a single string not two, it's simple logic.
One match for one string.
Previous Comments:
------------------------------------------------------------------------
[2009-08-09 11:55:26] rasmus@php.net
I am also pretty sure that this isn't actually a bug. Doing a
match_all on a non-anchored pattern containing .* is going to match an
empty string. Remember that * means 0 or more instances of the previous
term. So, you are doing a match_all for 0 or more characters, and when
you do this non-anchored you are going to get an empty string matching
that. Change it to .+ (+ means 1 or more) and your patterns start to
make sense and as you will see, the output is what you expect.
------------------------------------------------------------------------
[2009-08-09 11:11:23] rasmus@php.net
If you change:
preg_match_all($p,$t,$m,PREG_SET_ORDER);
to:
preg_match($p,$t,$m);
There is no empty match. I get this output:
/.*/<br /><div style="color: green;">ok</div><pre>array (
0 => 'some text',
)</pre><br /><br />/.*$/<br /><div style="color:
green;">ok</div><pre>array (
0 => 'some text',
)</pre><br /><br />/^.*/<br /><div style="color:
green;">ok</div><pre>array (
0 => 'some text',
)</pre><br /><br />/^.*$/<br /><div style="color:
green;">ok</div><pre>array (
0 => 'some text',
)</pre><br /><br />
If you can get this effect with preg_match(), please show how.
------------------------------------------------------------------------
[2009-08-09 10:49:19] inf3rno dot hu at gmail dot com
It's not preg_match_all specific, same bug with every preg function.
------------------------------------------------------------------------
[2009-08-08 21:04:32] pajoye@php.net
Not windows specific
------------------------------------------------------------------------
[2009-08-08 20:08:15] inf3rno dot hu at gmail dot com
Description:
------------
For pattern: .* there is an empty match at the end of the string.
Reproduce code:
---------------
$p1='/.*/';
$p2='/.*$/';
$p3='/^.*/';
$p4='/^.*$/';
$test='some text';
function test($p,$t)
{
preg_match_all($p,$t,$m,PREG_SET_ORDER);
echo $p.'<br />';
if (count($m)==1)
echo '<div style="color: green;">ok</div>';
else
echo '<div style="color: red;">bug</div>';
echo '<pre>'.var_export($m,true).'</pre>';
echo '<br /><br />';
}
test($p1,$test);
test($p2,$test);
test($p3,$test);
test($p4,$test);
Expected result:
----------------
I'm expecting one match in the preg_match_all result array, and I will
get two instead of one. The second match is empty.
Actual result:
--------------
/.*/
bug
array (
0 =>
array (
0 => 'some text',
),
1 =>
array (
0 => '',
),
)
/.*$/
bug
array (
0 =>
array (
0 => 'some text',
),
1 =>
array (
0 => '',
),
)
/^.*/
ok
array (
0 =>
array (
0 => 'some text',
),
)
/^.*$/
ok
array (
0 =>
array (
0 => 'some text',
),
)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=49198&edit=1