Replace throwing Unknown Modifier Error

Question

I've tested the regex and seems to work perfectly, but when placing it within Craft it seems to throw the following error:

preg_replace(): Unknown modifier '/'

  {% set ig = user.instagram|raw|replace('/(?:(?:http|https):\/\/)?(?:www.)?(?:instagram.com|instagr.am)\/([A-Za-z0-9-_\.]+)/im') %}
  {{ ig }}

Answer 1

You'll need to double escape those backslashes in the regex.

  {% set ig = user.instagram|raw|replace('/(?:(?:http|https):\\/\\/)?(?:www.)?(?:instagram.com|instagr.am)\\/([A-Za-z0-9-_\\.]+)/im') %}