Edit report at https://bugs.php.net/bug.php?id=63218&edit=1
ID: 63218
User updated by: jille at hexon dot cx
Reported by: jille at hexon dot cx
Summary: Recursion and greedy
Status: Open
Type: Bug
Package: PCRE related
Operating System: n/a
PHP Version: 5.4.7
Block user comment: N
Private report: N
New Comment:
5.3.10 has the same problem.
Previous Comments:
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[2012-10-04 11:38:16] jille at hexon dot cx
Description:
------------
See test-script. When I make the recursive-backreference (?R) optional (with ?)
it doesn't match $str to its full extent.
Test script:
---------------
<?php
$str = "A{X|param:{Y}}B";
$reWanted = '/{[A-Z]+(\|param:[^|}]*(?R)?[^|}]*)*}/';
var_dump(preg_match($reWanted, $str, $m), $m);
$reWorking = '/{[A-Z]+(\|param:[^|}]*(?R)[^|}]*)*}/';
var_dump(preg_match($reWorking, $str, $m), $m);
$reWorking2 = '/{[A-Z]+(\|param:([^|}]*(?R)[^|}]*|[^|}]*))*}/';
var_dump(preg_match($reWorking2, $str, $m), $m);
?>
Expected result:
----------------
For all three cases:
int(1)
array(3) {
[0]=>
string(13) "{X|param:{Y}}"
[1]=>
string(10) "|param:{Y}"
[2]=>
string(3) "{Y}"
}
Actual result:
--------------
Using $reWanted gives this instead of the expected result. Note the missing }
int(1)
array(2) {
[0]=>
string(12) "{X|param:{Y}"
[1]=>
string(9) "|param:{Y"
}
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=63218&edit=1
