Bug #10668 Updated: preg_replace backquote failure

ID: 10668 User updated by: smoonen@andstuff.org Reported By: smoonen@andstuff.org Old Status: Analyzed Status: Closed Bug Type: PCRE related Operating System: Linux PHP Version: 4.0.5 New Comment: Appears to have been a passing bug in a particular compile. Cannot repeat. Closing. Previous Comments: ------------------------------------------------------------------------ [2001-05-04 15:32:15] smoonen@andstuff.org 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... ------------------------------------------------------------------------ [2001-05-04 15:17:51] andrei@php.net Oops, \\1 instead of \1. ------------------------------------------------------------------------ [2001-05-04 15:17:15] andrei@php.net Ok, I made a little mistake, use "f('\\\\1')" rather than "f('\1')". ------------------------------------------------------------------------ [2001-05-04 13:59:27] smoonen@andstuff.org 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] andrei@php.net 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. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/?id=10668 Edit this bug report at http://bugs.php.net/?id=10668&edit=1