Ignore one word with regex

Solution:

The ^(?!stack.com$).* regex matches any string (even an empty one) that does not start with stack.com.

To match stack.com but not inside stack.com/wp-admin, you need a negative lookahead:

/stack\.com(?!\/wp-admin)/
           ^^^^^^^^^^^^^

Or better, with word boundaries to only match whole words:

/\bstack\.com\b(?!\/wp-admin)/

See the regex demo

Details:

• \b – a leading word boundary
• stack\.com – a literal string stack.com (a dot must be escaped)
• \b – a trailing word boundary
• (?!\/wp-admin) – a negative lookahead that fails the match if there is /wp-admin immediately to the right of the current location.