preg_match error

  • After WP 5.3 update/PHP 7 update, getting this error message:

    Warning: preg_match(): Compilation failed: invalid range in character class at offset 153 in /wp-content/plugins/auto-featured-image/auto-featured-image.php on line 111

    It would actually be great if this auto-featured-image were a part of WordPress core code, so that whenever you upload one image you could have that just be the featured image by default.

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