Re: Bug #15203: ereg_replace fails on strings containing backslashes

While I did reproduce this on a linux system (2.4.9 kernel) with PHP 4.1.1, the goal of the script doesn't seem to match the description -- the regexes are looking to replace four backslashes with two, not two backslashes with one. (Unless you're not counting that two backslashes are actually seen as a single backslash because they're being escaped.) I did notice something odd, though. I wrote a similar script in Perl to see if preg_replace was acting properly, 'cause it seemed a little wonky. It seems the ereg is acting correctly (obviously -- it's not going to match four (escaped) backslashes to a string of two backslashes. However, the preg_replace is acting weird -- why is it matching a string of two backslashes to a regex containing four? The Perl script that this should be equivalent to is something like $d = "\\\\"; print "--$d--" . length($d) . "\n"; $d =~ s/\\\\\\\\/\\\\/; print "--$d--" . length($d) . "\n"; Which spits out --\\--2 --\\--2 which matches the ereg_replace as expected, but not the preg_replace. So I guess there is a bug there, just not with ereg_replace, but with preg_replace. J Josef Svoboda wrote: > From: josef.svoboda@email.cz > Operating system: FreeBSD 4.2 > PHP version: 4.0.5 > PHP Bug Type: POSIX related > Bug description: ereg_replace fails on strings containing backslashes > > The goal is to replace sequence of two backslashes in $text by one > backslash. While preg_replace works, ereg_replace does not make any change > to $text. > > > echo "preg_replace\n"; > $text="\\\\"; > echo "--".$text."--".strlen($text)."\n"; > $text=preg_replace( "/\\\\\\\\/", "\\\\", $text); > echo "--".$text."--".strlen($text)."\n"; > echo "\n"; > echo "ereg_replace\n"; > $text="\\\\"; > echo "--".$text."--".strlen($text)."\n"; > $text=ereg_replace( "\\\\\\\\", "\\\\", $text); > echo "--".$text."--".strlen($text)."\n"; > > > ./configure \ > --with-mysql=/usr/local/mysql \ > --with-imap=/usr/ports/new/imap \ > --enable-track-vars \ > --enable-trans-sid > >