bbcode little problem

Hi:

I have written a class to parse bbcode.

I am having little problem with regular expression.

preg_replace('/\[quote\](.+?)\[\/quote\]/is', '<pre>$1</pre>', $mytext)

Code (markup):

This is simple code to convert all QUOTES tags. It is working fine.
But when i have text like this:

[ quote ]here is some text[ quote ]here is more text[ / quote ][ / quote ]

Code (markup):

Then it is creating problem.
It will print this:

[ quote ]here is some text

[ / quote ]

Code (markup):

Is there any solution to parse 2 or more level QUOTES??

Thanks
Burhan Khan

 

Try this.

preg_replace('@\[(?i)quote\](.*?)\[/(?i)quote\]@si', '<pre>$1</pre>', $mytext)

Code (markup):

 

Still not working.......
Same output as previous.

 

/\[\s+?quote\s+?\](.+?)\[\s+?\/\s+?quote\s+?\]/si

Code (markup):

 

Judging by the previous replies, I think the spaces were just to stop the forum parsing the quote tags. The problem is not with the regex, it's the nested bbcode - without a much more complex parser, you can't match up the corresponding open and close tags.

After parsing a quote tag, it continues from the end position of the last replacement to look for the next opening quote tag. Obviously that won't work if we have a nested quote tag because we need it to go back to the beginning in order to find it.

As already mentioned, you would need a more advanced parser to match up the open quote tags with their respective close tags. However, if we just put the replacement in a loop, it will continue finding pairs of tags till everything has been converted.

I dunno if that makes sense, hopefully should do with an example. (I'll rename quote to "tag" so I can use the [tag] syntax without the forum bbcode parser interfering).

Using the example text in the OP, the first replacement would convert:

[b][tag]here is some text[tag]here is more text[/tag][/b][/tag]

Code (markup):

Now if we rerun the replacement, it will next work on:

<tag>here is some text[b][tag]here is more text</tag>[/tag][/b]

Code (markup):

And that gets converted to our desired format:

<tag>here is some text<tag>here is more text</tag></tag>

Code (markup):

The parser never actually works out how much it should consume to match up the pairs of [tag] and [/tag] correctly, but by continuing the replacements till all pairs are converted (albeit mismatched pairs), we can get the desired end result.

while ( preg_match('/\[quote\](.+?)\[\/quote\]/is', $mytext) ) 
    $mytext = preg_replace('/\[quote\](.+?)\[\/quote\]/is', '<pre>$1</pre>', $mytext);

PHP:

 

Thanks rodney88 , it is working for me now!

But i have little more problem.

Actually i want to remove sub string from a string.

Criteria is like this:

this is starting of string [B][tag][tag] here is some other code[/tag]here is some code[/tag][/B] this is ending of string...

Code (markup):

You can see in this string there are many nested [tags].

I just want to remove those all nested tags. And out put should be:

this is starting of string  this is ending of string...

Code (markup):

I have tried many patterns but useless.
Any help will be highly appreciated.

Thanks
Burhan Khan