Dotan, try this:
$text="<p>First paragraph</p>\n<p>More text</p>\n<p>Some more
text</p>\n<p>End of story</p>";
$story = preg_replace('{(?=<p(?:>|\s)(?!.*<p(?:>|\s)))}is', "<p>new
paragraph goes here</p>\n", $text);
This matches a position that has an opening <p> tag (with or without
parameters), which is NOT followed anywhere in $text by another opening <p>
tag. The replacement string will be inserted at the matched position, which
will be directly before the last <p> tag. Not sure if this is the most
efficient regex, but it should get the job done. Let me know how it goes...
I'd also be interested to hear any comments on that regex's efficiency.
-Brian Rue
Dotan Cohen wrote:
> On 27/08/07, Richard Lynch <ceo@xxxxxxxxx> wrote:
>> On Sun, August 26, 2007 3:41 pm, Dotan Cohen wrote:
>> > I have a string with some HTML paragraphs, like so:
>> > $text="<p>First paragraph</p>\n<p>More text</p>\n<p>Some more
>> > text</p>\n<p>End of story</p>";
>> >
>> > I'd like to add an image before the last paragraph. I know that
>> > preg_replace can replace only the first n occurrences of a string, but
>> > how can I replace the _last_ occurrence of a string? My initial idea
>> > was to do this:
>> > 1) Count how many times "</p>\n<p>" occurs as $n
>> > 2) Replace them all with "</p>\n<img src= alt=>\n<p>"
>> > 3) Replace $n-1 replacements back to "</p>\n<p>"
>> >
>> > Is there a cleaner way? Thanks in advance.
>>
>> If the string really really ENDS on that LAST "</p>", then you can key
>> off of that:
>>
>> $story = preg_replace("|(<p>.*</p>\$|Umsi",
>> "<p>$new_paragraph</p>\n\\1", $story;
>>
>> You may have to fiddle with the DOT_ALL setting to only match the true
>> end of string and not just any old "\n" within the string...
>> http://php.net/pcre
>>
>
> Thanks, Richard, I was also trying to use a regex with pre_replace and
> getting nowhere. In the manual page for strrpos, there is a
> user-comment function for finding the last occurrence of a string:
> http://il2.php.net/manual/en/function.strrpos.php#56735
>
> However, I am unable to piece 2 and 2 together.
>
> Note that I'm adding a paragraph before the last paragraph, so I'm
> searching for the last instance of "</p>\n<p>".
>
> This is what I've done to your code, but I'm unable to get much further:
> $text = preg_replace("|(</p>\n<p>)\$|Umsi", "</p>\n<p>Test</p>\n<p>",
> $text);
>
> Dotan Cohen
>
> http://lyricslist.com/
> http://what-is-what.com/
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