The following function
function stripbbtags ($string) {
$pattern = "/\[([^\]]+?)(=[^\]]+?)?\](.+?)\[/\1\]/";
$replace = "";
return preg_replace($pattern, $replace, $string);
}
returns an error:
Unknown modifier
with some cryptic character that looks like SOH in Notepad++ but has a black background. Really weird.
How about this:
function stripbbtags ($string) {
$pattern = "#\[([^\]]+?)(=[^\]]+?)?\](.+?)\[/\1\]#";
$replace = "";
return preg_replace($pattern, $replace, $string);
}
The error message is a bit cryptic but actually give you some insight, if take a look at the documentation of preg_replace, you would notice they talk about modifiers. Those modifiers are used to pass options to the PCRE library, i.e. do some case insensitive match, string is in unicode etc.
The problem relies in the character you are using as separator; you are using / and the regular expression contain a slash so PCRE thinks \1\]/ is your modifier. Changing the separator to # fixes the problem.
Well, your delimiter is / and after your closing delimiter is the string \1\]/, but neither \1 nor the other characters are valid modifiers.
Pick a different delimiter, or simply escape all occurrences of it within your expression.
[quote]tags to be nested.) If so, your solution will need to be a bit more complex. The one you have now will not work correctly with nested tags.