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Posted by ctiggerf on 08/11/06 17:41
ctiggerf wrote:
> I am having a regular expression problem with a bit of code I'm working
> on. I was able to get a similar piece of code working in perl, but now
> I'm trying to convert it over. Basically what I'm trying to do here is
> some thing like this
>
> Get some html from an external file
> Look for my ids inside of the html, my ids look like {{###}}.
> Replace all the urls the ids are in with a url I get from my database
> matching the id.
>
> Here is a little sample code:
>
> <?php
>
> #some html - normally pulled from a text file on a server
> $html="Some <b>Stuff</b> Before the <a
> href='http://example.com'>Example</a><br>\n- "
> ."<a href='http://example.com/example.php?id={{111}}'>Example
> 1</a><br>\n- Now for 2:"
> ."<a href=\"http://example.com/example.php?id={{2222}}\">Example
> 2</a><br>\n- Now for 3:"
> ."<a href='http://example.com/example.php?id={{33}}&m=1'>Example
> 3</a><br>\n- Now for 4:"
> ."<a href=\"http://example.com/example.php?id={{111}}\">Example
> 4</a<br>\n- "
> ."Some <b>Stuff</b> After the <a
> href='http://example.com'>Example</a><br>";
>
> #Disply the Orignal
> echo "<textarea cols=100 rows=6>$html</textarea>";
>
> #Find all the id's
> preg_match_all("/{{(\d+)}}/", $html, $matches, PREG_SET_ORDER);
> foreach($matches as $match) {
> $id=$match[1];
>
> #the replace string - this would normally be pulled from a database
> matching the id
> $replace="http://example2.com/example2.php?id=$id";
>
> #the pattern
> $pattern="/href=('|\")[^\1]*?{{".$id."}}[^\1]*?\1/i";
>
> #print out what matches:
> echo "<br><textarea cols=100 rows=4>$pattern\n";
> preg_match($pattern, $html, $ms);
> print_r($ms);
> echo "</textarea>";
>
> #make the replacements:
> $html=preg_replace($pattern,$replace,$html);
> }
>
> #show the new html
> echo "<br><textarea cols=100 rows=6>$html</textarea>";
>
> ?>
>
> I've tried just about everything I can think of in that second regular
> expression and can't get it to match. Any help you can give would be
> appreciated.
>
> Thank you,
> Chris.
Well, I spent something like 10 hrs farting with this before I posted.
I guess I just needed 1 more hour after playing with it. The new
pattern should be ..
$pattern="/href=(\"|').*?{{(".$id.")}}.*?\\1/i";
There were a couple of problems from earlier .. the ones I know of are:
\1 needed to be \\1 - Because you actually need the escape character in
the regular expression.
{{####}} needed to be {{(####)}} - Not exactly sure why, but my guess
was that it thought {{111}} was a quantifier
Perl wouldn't have had a problem with that because patterns are not
enclosed in strings in perl.
Thanks anyways if you started to look at it before I got this in.
--Chris.
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