[PHP] Regular expression question

[Dan Phiffer]

So I'm trying to implement a simple wiki-like syntax for hyperlinking. 
Basically I want to match stuff like [this], where the word 'this' gets 
turned into a hyperlink. I have that working, but I want to be able to 
escape the opening bracket, so that it's possible to do \[that] without 
having it match as a link. Here's what I've got:

// Matches fine, but without escaping
$pattern = "
    /
        \[          # Open bracket
        ([^\]]+?)   # Text, including whitespace
        \]          # Close bracket
    /x
";
// Throws an unmatched bracket warning
$pattern = "
    /
        [^\\]       # Don't match if a backslash precedes
        \[          # Open bracket
        ([^\]]+?)   # Text, including whitespace
        \]          # Close bracket
    /x
";
// Ignores escaping: \[example] still matches
$pattern = "
    /
        [^\\\]      # Don't match if a backslash precedes
        \[          # Open bracket
        ([^\]]+?)   # Text, including whitespace
        \]          # Close bracket
    /x
";
Nothing seems to change if I keep adding backslashes to that first 
matching thingy (i.e. the escaping still doesn't work). Any ideas?

Thanks much,
-Dan
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