ID: 10668
User Update by: [EMAIL PROTECTED]
Status: Analyzed
Bug Type: PCRE related
Description: preg_replace backquote failure
H'm... I'm confused. :-) To complicate things further, the e-mails display half as
many backslashes as the web page. :-) Since I'm not sure what you mean, I'll
exhaustively list the behaviors:
The following:
$str = "abc'\\\\''def";
function f($s) { var_dump($s); return "x"; }
print preg_replace("/c(.*)d/e", "f('\\1')", $str);
gives the error messages I posted earlier. (That's two backslashes before the 1.)
The following:
$str = "abc'\\\\''def";
function f($s) { var_dump($s); return "x"; }
print preg_replace("/c(.*)d/e", "f('\\\\1')", $str);
gives the result:
string(2) "\1" abxef
which isn't what I want. (That's four backslashes before the 1.)
Prefixing the "1" with one or three backslashes in each case emits an ASCII x'01'.
None of which are what I want to occur...
Previous Comments:
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[2001-05-04 15:17:51] [EMAIL PROTECTED]
Oops, \1 instead of 1.
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[2001-05-04 15:17:15] [EMAIL PROTECTED]
Ok, I made a little mistake, use "f('\\1')" rather than "f('1')".
---------------------------------------------------------------------------
[2001-05-04 13:59:27] [EMAIL PROTECTED]
Oddly, I get the following error:
Warning: Unexpected character in input: '' (ASCII=92) state=1 in
/home/groups/t/ta/tavi/htdocs/playground/test.php(4) : regexp code on line 1
Parse error: parse error in /home/groups/t/ta/tavi/htdocs/playground/test.php(4) :
regexp code on line 1
Fatal error: Failed evaluating code: f(''\\''') in
/home/groups/t/ta/tavi/htdocs/playground/test.php on line 4
PHP compile options may be seen at:
http://tavi.sourceforge.net/playground/phpinfo.php
---------------------------------------------------------------------------
[2001-05-04 12:58:12] [EMAIL PROTECTED]
Can you explain why you think it fails? The following sample (slightly modified from
yours to dump the $s parameter to function):
$str = "abc'\\''def";
function f($s) { var_dump($s); return "x"; }
print preg_replace("/c(.*)d/e", "f('\1')", $str);
outputs:
string(5) "'\''"
abxef
As it should.
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[2001-05-04 11:44:19] [EMAIL PROTECTED]
The following code succeeds on PHP 4.03 and PHP 4.04pl1, but fails on PHP 4.05:
$str = "abc'\\''def";
function f($s) { return "x"; }
print preg_replace("/c(.*)d/e", "f('\1')", $str, -1);
This seems to expose *two* underlying bugs:
1) There appears to be some problem in the regex state
machine
2) There is a definite problem with the replacement of
the backreference with its corresponding string.
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The remainder of the comments for this report are too long. To view the rest of the
comments, please view the bug report online.
Full Bug description available at: http://bugs.php.net/?id=10668
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