Get link value only from the_content()

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$post_link = get_the_permalink();
if ( preg_match('/<a (.+?)>/', get_the_content(), $match) ) {
    $link = array();
    foreach ( wp_kses_hair($match[1], array('http')) as $attr) {
        $link[$attr['name']] = $attr['value'];
    }
    $post_link = $link['href'];
}

http://wordpress.stackexchange.com/questions/13448/get-link-value-only-from-the-content

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