[RSS Feed/News] Invalid Regex

[XenForo]

Hello,

I am trying to use the following regex to validate LinkedIn profile url as a custom field. However, XF is responding with "please enter a valid regular expression"

/^(https:\/\/)?((www|\w\w)\.)?linkedin.com\/((in\/[^/]+\/?)|(pub\/[^\/]+\/((\w|\d)+\/?){3}))$/
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