Rob Ellis wrote:
On Thu, May 27, 2004 at 09:59:05AM -0700, Dan Phiffer wrote:
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?
Try negative lookbehinds...
$pattern = ' / (?<!\\\\) \[ # open [ not preceded by a backslash (.*?) # ungreedy match anything (?<!\\\\) \] # close ] not preceded by a backslash /x ';
- Rob
BTW, instead of un-greedy maych anything (.*?) You could use a negative group....of course to deal with \] as well you have to do alittle more:
([^\]]|[\\\\\]])*
-- paperCrane <Justin Patrin>
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