StrTran() is now Case In-sensitive if you want it to be. For example:

?strtran('AaAa', 'A', 'B', -1, -1, 0)
?strtran('AaAa', 'A', 'B', -1, -1, 1)

returns

BaBa
BBBB

The last parameter is teh Case Sesnsitive, 0 means sensitive and 1 means in (regardless of what IntelliSense tells you). 2 things. You'll notice the -1 in the code, that means just give these parameters default values. And you'll also see that regardless of the case found, it always replaces it with the case you have as teh third variable. Thats why we have "BBBB" instead of "BbBb".