Issue with RegEx contains pipe (|)

I am using some regex in my validation. Others are working well but this:

regex_match[/((?:https?:\/\/)?(?:www\.)?(?:\w\w\.)?example\.com\/)((([\w]{2,3})?)|([^\/]+\/(([\w|\d-&#?=])+\/?){1,}))$/]

Error is:
preg_match(): No ending delimiter '/' found
"/((?:https?:\\/\\/)?(?:www\\.)?(?:\\w\\w\\.)?linkedin\\.com\\/)((([\\w]{2,3})?)|([^\\/"

After searching about this issue just found that, there was an issue about it (1122) though it was solved.

"Who thinks in code"
Perfectly describes who I am
mbparvez.me