| FreeMat
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Section: String Functions
The lower function converts a string to lower case with the syntax 
y = lower(x)
 where x is a string, in which case all of the upper case characters in x (defined as the range 'A'-'Z') are converted to lower case. Alternately, you can call lower with a cell array of strings 
y = lower(c)
in which case each string in the cell array is converted to lower case.
A simple example:
--> lower('this Is Strange CAPitalizaTion')
ans = 
this is strange capitalization
and a more complex example with a cell array of strings
--> lower({'This','Is','Strange','CAPitalizaTion'})
ans = 
 [this] [is] [strange] [capitalization]