Basic html regex

I'm looking in PHP to replace:

<author>$foo</author>
with
<h2><a
href="profile.php?id=$id">$foo</a></
h2>

I guess I need a regex to find the string, then I need to
grab $foo and
look up $id in the database using it. Any ideas?


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1. match '$foo' in '<author>$foo</author>'
with

(?<=<author>).*?(?=</author>)

2. trim '$foo' of any white-apaces

3. look-up in your DB to get a corresponding ID

4. construct the desired str '<h2><a
href="profile.php?id=$id">$foo</a></
h2>' from its parts

5. do replacement: this can be tricky; might need to use a
delegate to
do it (similar to .NET MatchEvaluator function). In this (or
similar)
case, u'll have ot do all the processing including a DB
call inside
your Regex.Replace() function.


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Matt wrote:
> I'm looking in PHP to replace:
>
> <author>$foo</author>
> with
> <h2><a
href="profile.php?id=$id">$foo</a></
h2>
>
> I guess I need a regex to find the string, then I need
to grab $foo and
> look up $id in the database using it. Any ideas?

you've almost got it, except that you need metaquotes with
your
variables in the pattern part..So, given any variable $foo,
you may
first check the corresponding $id from the database, like:

$id = check_your_database($foo);

and then

$newtext =
preg_replace("/<author>\Q$foo\E<\/author&g
t;/i", "<h2><a
href=\"profile.php?id=$id\">$foo</a>&
lt;/h2>", $oldtext);

But if you don't know the variable $foo beforehead, then
you may need
to use the function preg_replace_callback() instead.. for
example:

function toh2($matches)
{
    $foo = matches[1];
    $id = check_your_database($foo);
    return "<h2><a
href=\"profile.php?id=$id\">$foo</a>&
lt;/h2>";
}
$newtext =
preg_replace_callback("/<author>(.*?)<\/auth
or>/i", "toh2",
$oldtext);

(untested)
Xicheng


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Sergei Z wrote:
> 1. match '$foo' in
'<author>$foo</author>' with
>
> (?<=<author>).*?(?=</author>)
>
> 2. trim '$foo' of any white-apaces
>
> 3. look-up in your DB to get a corresponding ID
>
> 4. construct the desired str '<h2><a
>
href="profile.php?id=$id">$foo</a></
h2>' from its parts
>
> 5. do replacement: this can be tricky; might need to
use a delegate to
> do it (similar to .NET MatchEvaluator function). In
this (or similar)
> case, u'll have ot do all the processing including a
DB call inside
> your Regex.Replace() function.

Hi, Sergei:

I just checked several programming languages, like Perl,
.NET,
JavaScript, PHP, all of them support a function call in the
replacement
part(but the implementations are quite different.. )..and
Perl/PHP
also have /e modifier that makes things much easier. 

BTW. I sent a PM to your account at RegexAdv.com. hope
you've got it.
and have a good day,

Xicheng


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Xicheng Jia wrote:

> you've almost got it, except that you need metaquotes
with your
> variables in the pattern part..So, given any variable
$foo, you may
> first check the corresponding $id from the database,
like:
>
> $id = check_your_database($foo);
>
> and then
>
> $newtext =
preg_replace("/<author>\Q$foo\E<\/author&g
t;/i", "<h2><a
>
href=\"profile.php?id=$id\">$foo</a>&
lt;/h2>", $oldtext);
>
> But if you don't know the variable $foo beforehead,
then you may need
> to use the function preg_replace_callback() instead..
for example:
>
> function toh2($matches)
> {
>     $foo = matches[1];
>     $id = check_your_database($foo);
>     return "<h2><a
href=\"profile.php?id=$id\">$foo</a>&
lt;/h2>";
> }
> $newtext =
preg_replace_callback("/<author>(.*?)<\/auth
or>/i", "toh2",
> $oldtext);
>
> (untested)
> Xicheng

Thank you very much, with a bit of modification this worked
perfectly,
thanks!


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