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IgnoreCase

IgnoreCase
is an option for string manipulation and searching functions which specifies whether lower- and upper-case letters should be treated as equivalent.
  • With the default setting IgnoreCase->False, lower- and upper-case letters are treated as totally different.
  • With the setting IgnoreCase->True, lower- and upper-case letters are treated as equivalent.
  • IgnoreCase in no way affects the parsing of Mathematica expressions.
With IgnoreCase->True, lower- and upper-case letters are treated as equivalent:
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Use IgnoreCase->False to treat lower- and upper-case letters as distinct letters:
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Out[2]=
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