Advanced PHP Regex - Parse Wordpress Post Content -

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i need extract text wordpress post.here code doesn't work, guess because regex, works fine on expresso, yet doesn't work on php.

$content = get_the_content(); preg_match('\<form id="form1.*?(?=<zmfj>)\', $content, $matches); $setupform = $matches[0]; echo $setupform;

in case variable content be: 

<form id="form1" method="post" action="http://google.com"><zmfj>

so extraction result should be

<form id="form1" method="post" action="http://google.com"> 

preg_match("/<form[^>]+>/", $content, $matches); //the [^>]+ bit matches consecutive characters not ">"

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