Question

WordPress sets several cookies with a random hash appended. How can I use Javascript (and regex?) to find out if a cookie named wordpress_logged_in_XXXXXXXXXXXXXXXXXX exists and what the name of it is?

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Answer 1

document.cookie is a string which contains all cookies, excluding the HTTP-only cookies.

To get any cookie which matches wordpress_logged_in_...., use:

document.cookie.match(/wordpress_logged_in_[a-z0-9]{32}=([^;]+)/)[1];

Explanation of pattern:

wordpress_logged_in_  # literally
[a-z0-9]{32}          # This fragment appears to be a md5 hash
=                     # literal =, separates a cookie key from its value
([^;]+)               # Create a group, containing all consecutive non-; chars
                      # ; marks the end of a cookie key-value pair.