How do i make Xpath search case insensitive

Question

I\'m currently making a xpath search, I\'ve got the the search working but I need to make it case insensitive. The xml file I\'m using is 1.0 which from my research means I\

Answer 1

The currently accepted answer is flawed -- because nothing guarantees that the second argument of contains() is already converted to lower case.

Also, it uses '$search' -- and this is literally the string "$search" -- not the variable $search.

Here is a correct solution:

//channel/item
   [contains(translate(., 
                       'ABCDEFGHJIKLMNOPQRSTUVWXYZ', 
                       'abcdefghjiklmnopqrstuvwxyz'),
             translate($txtSearch, 
                       'ABCDEFGHJIKLMNOPQRSTUVWXYZ', 
                       'abcdefghjiklmnopqrstuvwxyz')
             )
   ]

The corresponding XPath 2.0 expression:

//channel/item[contains(lower-case(.), lower-case($txtSearch))]

Update:

Based on this solution, @alain.janinm has corrected his answer.