ID: 11540
User Update by: [EMAIL PROTECTED]
Status: Open
Bug Type: *Regular Expressions
Operating system: Windows
PHP Version: 4.0.5
Description: Backslash and regular expressions
I am told that I should put four backslahes in my pattern to make it match a single
backslash.
This is good in static patterns. But my pattern is a variable string which I want to
put in good pattern format using the fonction preg_quote.
But this function transforms one backslash in only two backshlashes (and not 4 !)...
Thus, the only way to make my program work is to apply two times this function
preg_quote. This works, but this is not very nice, is it ?
So, isn't there a bug in function preg_quote ?
Thanks in advance,
Olivier Roos
Previous Comments:
---------------------------------------------------------------------------
[2001-06-18 11:53:03] [EMAIL PROTECTED]
Hello,
I have to write a program which replaces backslashes by slashes into HTML code. I
would like to do this using regular expressions.
Unfortunately, there may be a problem in pattern matching as PHP does not seem to work
properly as soon as I add some backslashes in my patterns...
Here is a small example which illustrates the problem:
<?
$test = "X\X"; // $test is a string containing a backslash
echo $test."n";
echo preg_quote($test)."n";
echo preg_match("/X\X/", $test)."n";
?>
The output of this program is the following:
XX
X\X
0
The '0' means that the preg_match failed... But the pattern of this preg_match was the
string $test quoted by preg_quote to become a valid pattern... (as you can see on
second line of the output).
So this preg_match should output '1', shouldn't it ??
Thanks in advance for any help or advice,
Olivier Roos
---------------------------------------------------------------------------
Full Bug description available at: http://bugs.php.net/?id=11540
--
PHP Development Mailing List <http://www.php.net/>
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
To contact the list administrators, e-mail: [EMAIL PROTECTED]
