Bug #11540 Updated: Backslash and regular expressions

ID: 11540 Updated by: andre Reported By: oroos@fmlogistic.pl Old-Status: Closed Status: Bogus Bug Type: *Regular Expressions Operating system: PHP Version: 4.0.5 Assigned To: Comments: Previous Comments: --------------------------------------------------------------------------- [2001-06-20 03:02:45] oroos@fmlogistic.pl 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 --------------------------------------------------------------------------- [2001-06-18 11:53:03] oroos@fmlogistic.pl 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 --------------------------------------------------------------------------- ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=11540&edit=2