Assistance Needed to Locate Formula Fields which include Specific String

Under Application Management, there is a tool for Search and Replace.  I suggest that you make a copy of your app and try it there first.

Also, the best practiceis not to hard code your URLs.  The best practice is syntax like this

URLRoot() & "db/" & [_DBID_my_table_ name _Alias from Advanced_Properties] & "?a= ... continue with the url.  That way if your root URL company name changes or you copy an app and your table ID's all change,  the formula buttons will still work.