extract domains from webpage source

[german47]

Hi, I need help by extracting all domain names from the sourcecode of a webpage.

For example:

$source = "<b>domain1.com</b> <b>domain2.net</b> <b>domain3.org</b>";

I need to parse it with preg_match_all and then the result should be in one array.

Array (
[1] => domain1.com,
[2] => domain2.net,
[3] => domain3.org
)

Can anyone help me with the regular expresion?

Thanks in advice!