用正则表达式解析HTML并不理想。更好的选择是使用DOMDocument 和DOMXpath;

此代码使用DOMDocument 和DOMXpath 在不依赖正则表达式的情况下解析和修改HTML。内容中的每个链接都有onclick 属性与相应的window.open() 使用从href 属性这个href 然后从链接中删除属性。

add_filter( \'the_content\', \'wpse_cordova_links\', 10, 1 );
function wpse_cordova_links( $content ) {
    // Create an instance of DOMDocument.
    $dom = new \\DOMDocument();

    // Suppress errors due to malformed HTML.
    // See http://stackoverflow.com/a/17559716/3059883
    $libxml_previous_state = libxml_use_internal_errors( true );

    // Populate $dom with $content, making sure to handle UTF-8, otherwise
    // problems will occur with UTF-8 characters.
    $dom->loadHTML( mb_convert_encoding( $content, \'HTML-ENTITIES\', \'UTF-8\' ) );

    // Restore previous state of libxml_use_internal_errors() now that we\'re done.
    // Again, see http://stackoverflow.com/a/17559716/3059883
    libxml_use_internal_errors( $libxml_previous_state );

    // Create an instance of DOMXpath.
    $xpath = new \\DOMXpath( $dom );

    // Query all links within our content.
    $links = $xpath->query( \'//a\' );

    // Iterate over the $links.
    foreach ( $links as $link ) {
        if ( $link->hasAttributes() ) {
            // Get the value of the href attribute
            $link_href = $link->getAttribute( \'href\' );

            // Create an onlick attribute and set the value
            $link_onclick = $dom->createAttribute( \'onclick\' );
            $link_onclick->value = "window.open( \'" . $link_href . "\', \'_blank\', \'location=no\' );";
            $link->appendChild( $link_onclick );

            // Remove the href attribute
            $link->removeAttribute( \'href\' );
        }
    }

    // Save the updated HTML
    $content = $dom->saveHTML();    

    return $content;
}

Example HTML before processing

<p><a href="http://example.com/">click</a></p>

<p>Lorem ipsum dolor sit amet, ecclesiam mittam est amet constanter approximavit te. Introivit gubernum defunctam vivum eum ego esse ait mea Christianis<br>
<a class="test-class test-other-class" href="http://example.com/1/">click me too</a> aedificatur ergo accipiet duxit ad te. Ascendi in modo invenit ubi diu requievit agi coepit. Apollonii appropinquat tation ulterius quod ait mea Christianis aedificatur ergo accipiet si mihi esse deprecor cum. Equidem deceptum in fuerat eum est in, quoque sed quod ait est in fuerat.</p>

<p><a data-test="55" href="http://example.com/2/">click me as well</a></p>

<p>Lorem ipsum dolor sit amet, ecclesiam mittam est amet constanter approximavit te. Introivit gubernum defunctam vivum eum ego esse ait mea Christianis aedificatur ergo accipiet duxit ad te. Ascendi in modo invenit ubi diu requievit agi coepit. Apollonii appropinquat tation ulterius quod ait mea Christianis aedificatur ergo accipiet si mihi esse deprecor cum. Equidem deceptum<br>
<a id="test-id" class="test-class" href="http://example.com/3/">clicky</a> in fuerat eum est in, quoque sed quod ait est in <a>This link has no href attribute</a> fuerat.</p>

Example HTML after processing

<p><a onclick="window.open( \'http://example.com/\', \'_blank\', \'location=no\' );">click</a></p>

<p>Lorem ipsum dolor sit amet, ecclesiam mittam est amet constanter approximavit te. Introivit gubernum defunctam vivum eum ego esse ait mea Christianis<br>
<a class="test-class test-other-class" onclick="window.open( \'http://example.com/1/\', \'_blank\', \'location=no\' );">click me too</a> aedificatur ergo accipiet duxit ad te. Ascendi in modo invenit ubi diu requievit agi coepit. Apollonii appropinquat tation ulterius quod ait mea Christianis aedificatur ergo accipiet si mihi esse deprecor cum. Equidem deceptum in fuerat eum est in, quoque sed quod ait est in fuerat.</p>

<p><a data-test="55" onclick="window.open( \'http://example.com/2/\', \'_blank\', \'location=no\' );">click me as well</a></p>

<p>Lorem ipsum dolor sit amet, ecclesiam mittam est amet constanter approximavit te. Introivit gubernum defunctam vivum eum ego esse ait mea Christianis aedificatur ergo accipiet duxit ad te. Ascendi in modo invenit ubi diu requievit agi coepit. Apollonii appropinquat tation ulterius quod ait mea Christianis aedificatur ergo accipiet si mihi esse deprecor cum. Equidem deceptum<br>
<a id="test-id" class="test-class" onclick="window.open( \'http://example.com/3/\', \'_blank\', \'location=no\' );">clicky</a> in fuerat eum est in, quoque sed quod ait est in <a>This link has no href attribute</a> fuerat.</p>