'''string tolower''' ''string ?first? ?last?''

Returns a value equal to ''string'' except that all upper (or title) case letters have been converted to lower case. 
If ''first'' is specified, it refers to the first char index in the string to start modifying. 
If ''last'' is specified, it refers to the char index in the string to stop at (inclusive). 
''First'' and ''last'' may be specified as for the '''index''' method.

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See also:

   * [string]
   * [string index]
   * [string totitle]
   * [string toupper]

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