TWIG: How to parse custom tags?

Question

In TWIG templating engine, what would be the best way to parse the content like following:

[name="tom"]
    Lorem ipsum dolor <strong>sit amet</strong>, 
    consectetur adipiscing elit, 
    sed do eiusmod tempor incididunt
[/name]

into something like:

<blockquote>
    Lorem ipsum dolor <strong>sit amet</strong>, 
    consectetur adipiscing elit, 
    sed do eiusmod tempor incididunt
</blockquote>

And also fetch the value of name attribute. In the above given example, the value of attribute name is tom. Suggestions?

Answer 1

I ended up utilizing the Twig_SimpleFunction() method to create a custom TWIG function (extension).

/**
 * @var $html STRING FROM THE POST
 * @return $string RETURN AS STRING
 */
public function toBlockQuotedFormat($html) {

    $re = '/(.*?)\[name=(.*?)\]/';
    preg_match_all($re, $html, $matches);

    if(isset($matches[2][0])) {

        $name = $matches[2][0];
        // CONVERT THE NAME-TAG TO BLOCKQUOTE
        $html = str_replace("[name=".$name."]", "<blockquote>", $html);
        $html = str_replace("[/name]", "</blockquote>", $html);
    }

    return $html;
}

Then I was able to use {{ toBlockQuotedFormat(theHtmlVar|nl2br)|raw }} to parse it to desired <blockquote></blockquote> tag. I also have the $name value; however on this occasion I did not make use of it other than for str_replace function.