正则表达式更改引号冲突

Question

I'm trying to create a PHP regex to filter my content on WordPress. I would like to transform quotation marks " " like that « » with non-breaking space.

I also use Timber (TWIG) filter to achieve this.

The problem is that this filter also changes url tags and image tags .

Example:

<a href="http://www.example.com">My link</a>

<a href=« http://www.example.com »>My link</a>

What could I add in my regex to avoid this? Can I have some help please.

functions.php

public function add_to_twig( $twig ) {
        $twig->addExtension( new Twig_Extension_StringLoader() );
        $twig->addFilter( new Timber\Twig_Filter( 'changemarks', 'changemarks' ) );
        return $twig;
    }

function changemarks( $text ) {
    $regex = '/"(.*?)"/';
    $subst = '« $1 »';
    $result = preg_replace($regex, $subst, $text);

    return $result;
}

single.twig

{{ post.content|changemarks }}

Answer 1

It's difficult to make regular expression in html my solution is just select the string by make some space before and after " for text

    $regex = '/ "(.+?)" /';