How to use regex in --href-ignore argument

[cornernote]

I need to ignore some external links because they fail when checking from travis-ci. I started with a comma list of them, however as the list grows I would like to use regex to keep the list smaller.

I tried like the following:

htmlproof _site --href-ignore http://www.opencart.com/,https://www\.drupal\.org/.*
htmlproof _site --href-ignore "'http://www.opencart.com/','https://www\.drupal\.org/.*'"

However it still tries to check https://www.drupal.org/drupal-7.0. How can I use regex in this argument?

[cornernote]

Found the answer on a stackoverflow question:

http://stackoverflow.com/questions/29678646/can%C2%B4t-get-htmlproof-to-accept-an-ignore-pattern

Basically it needs to be between forward slashes:

htmlproof _site --href-ignore http://www.opencart.com/,/https:\/\/www\.drupal\.org\/.*/