ereg Problem

[webmasternovis]

Hi all,

I am trying to parse the word "href", but am having trouble.

Could anyone please help?

<?php 
$file_lines = file("http://www.example.com"); 

foreach ($file_lines as $line)
{
$page = htmlspecialchars($line); 
echo $page; 
}

$match = ereg("href", $page);

if($match) { 
echo "yes!"; 
} 
?> 

Thanks very much,
Mike 🙂

[sfullman]

I don't use ereg. I stopped a while back, I use preg_ instead because it's more powerful IMHO.

To catch an href:

$regex='/<a\s+[^{>]\shref=((\'[\']\')|("["]")|([a-z0-9_]+))(>|([>]*>))/i';}

if(preg_match_all($regex,$string,$matches)){
//you take it from here on the $matches array:
echo "<pre>";
print_r($matches);

}

May surprise you that a regex could be that complex but:
1. there's no requirement that the href=... be right after the <a..
2. though not all the best, any of these are kosher:

href='text in singles, "word dude" '
href="text in doubles"
href=solid_text_with_no_spaces

To test regex's, go to my tester, it's the best out there:
http://www.samuelfullman.com/team/php/tools/regular_expression_tester_p.php

You can even test code in remote pages, and there's docs.

I love regex's couldn't survive without them anymore.

[webmasternovis]

Thanks for your quick reply 🙂

My code is now:

<?php 
$file_lines = file("http://www.example.com"); 

$regex='/<a\s+[^>]*\s*href=(('[^']*')|("[^"]*")|([a-z0-9_]+))(>|([^>]*> ))/i';

if(preg_match_all($regex,$line,$matches))
{  

echo "<pre>"; 
print_r($matches); 

} 

?>

But I get a parse error for line four?

Please could you help?

Thanks sfullman,
Mike

[webmasternovis]

I worked out to get this, that kinda works...

 <?php  

$file_lines = file("http://www.sitestem.com");   

foreach($file_lines as $file)
if(preg_match_all('/(href=)+(").+\..+(")+/i',$file, $matches)) 
{   

echo "<pre>"; 
print_r($matches); 
}  

?>

But it returns other things after the URL. So really I'm asking how to end a string.

Please could someone help?
Thanks a lot,
Mike

[Weedpacket]

Originally posted by webmasternovis
Thanks for your quick reply 🙂

My code is now:

<?php 

$regex='/<a\s+[^>]*\s*href=(('[^']*')|("[^"]*")|([a-z0-9_]+))(>|([^>]*> ))/i';

But I get a parse error for line four?
[/B]

If you look at the syntax highlighting you'll see what's going wrong - those ' characters inside the string need to be escaped with \, or PHP will reckon they mark the end of the string.

[webmasternovis]

Thanks for your reply 🙂

I'm a bit of a newbie in PHP (i've been doing it quite a bit, just not very advanced in it!), so I don't think I've 'escaped' them correctly.

if(preg_match_all('/<a\s+[^>]*\s*href=((/'/[^/'/]*')|("[^"]*")|([a-z0-9_]+))(>|([^>]*> ))/i',$file, $matches)) 

I get a parse error...please could someone take a look?

Thanks a lot,
Mike 🙂

[Weedpacket]

\ not /

[webmasternovis]

Hi,

Sorry for the delayed reply, my server has been playing up all day so I've had to sort that out 🙁

Anyway, I've got this...

$regex='/<as+[^{>]shref=((\'[']\')|("["]")|([a-z0-9_]+))(>|([>]*>} ))/i';

I get a parse error though?

Please could someone help?

Thanks a lot,
Mike

[webmasternovis]

Anyone?

[sfullman]

go to this link:

Regulare Expression Tester

just work at it till youg get it, only way to learn regex's is by doing some practice.

sam

[webmasternovis]

Hi,

It keeps returning Result: BAD RESULT (pattern not found) what does that mean please?

Thanks for your reply,
Mike

[sfullman]

read the docs!!

your pattern should look like this:

/apple/i

your string is entered in the second window:

give me the green apple please

then click check it.

IF you have your string on a web page somewhere, then do that instead, enter http://yoursite.com/yourpage.htm instead of "give me the green apple please" -- it'll grab soruce code from your page.

Sam

[sfullman]

try this fo ryour code:

/<form[^{>]>(.|\s)?<\/form>/i}

and this for your string:

http://www.google.com/

-- very cool yes?

[webmasternovis]

Great tool! Thanks man!

I tried typing this in:

/(href=)+(").+..+(")/i

It all works and everything, returning data like this...

href="programming.html" class="menu2"

Do you know if there is anyway to exclude the class part?

Thanks very much,
Mike

[webmasternovis]

Sorry to bring this up again, but I've got quite far but come to another hault.

I'm getting all the html links from a site, and making a list. That part works fine. But I want to list all the links that start with http://www. below them (so they could be listed twice). That part doesn't work.

<?php
$file_lines = file('http://www.example.com);

foreach($file_lines as $file) {
if(preg_match_all('#<a\s+?href="'["'].*?>#', $file, $matches)) {
for ($i = 0; $i < count($matches[1]); $i++)
echo $matches[1][$i] . '<br />';
}
}
$match = implode("-", $matches);
if(preg_match_all('#(http://www.[/url]).+#', $match, $total)) {
for ($x = 0; $x < count($total[1]); $x++)
echo $total[1][$x] . '<br />';
}
?>

I get no errors, but the first list with all the links is the only thing that shows up.

Anyone know what's wrong?

Thanks a lot,
Mike