Regexp to extract attribute value from a <form> tag

[Thanasus]

Greetings,

I am stumbling here trying to put together a regular expressions, either POSIX or PCRE style, to extract out the value of an action attribute from a form tag (parsing out an HTML document).

Examples:

<fom action="http://www.domain.com" method="post">
<form action='http://www.domain.com' method='post'>

The attribute v alue could be surrounded by a single quote or double quote. Additionally, there could be spaces (*\s) between the attribute name, the equal sign, and the value.. such as
<form action = "http://www.domain.com" method="post">

Additionally, I am trying to capture all occurances of the attribute value within the specified string, so if a string has multiple HTML forms, then I would get an array containing all of the action values.

I figure preg_match_all would be the function to use and I am trying
preg_match_all('action=?(?(1) (.*?)\1 | ([^{\s>]+))',$document,$actions);}

but I am getting an error of

           Unknown modifier '(' 

This is my first foray into regular expressions and there must be something I am not grasping... any help is appreciated.

[milind24]

This will help you to extract action from <FORM> tag

if(preg_match_all('/(action(\\s*)=(\\s*)([\"\'])?(?(1)(.*?)\\2|([^\s\>]+)))/',$myform,$matches)) 
{
	for ($i=0; $i< count($matches[0]); $i++) 
		echo "matched $i: ".$matches[0][$i]."\n<br>";
} 
else 
   print "A match was not found.";