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based on an earlier version of the Wolfram Language.
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IgnoreCase

IgnoreCase
is an option for string manipulation and searching functions that specifies whether lowercase and uppercase letters should be treated as equivalent.
  • With the default setting IgnoreCase->False, lowercase and uppercase letters are treated as totally different.
  • With the setting IgnoreCase->True, lowercase and uppercase letters are treated as equivalent.
  • IgnoreCase is an option for many string, file and symbol name functions.
  • IgnoreCase in no way affects the parsing of Mathematica expressions.
With IgnoreCase->True, lowercase and uppercase letters are treated as equivalent:
Use IgnoreCase->False to treat lowercase and uppercase letters as distinct letters:
With IgnoreCase->True, lowercase and uppercase letters are treated as equivalent:
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Use IgnoreCase->False to treat lowercase and uppercase letters as distinct letters:
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IgnoreCase is set to False by default:
Find positions of successive identical characters independent of case:
This replaces all occurrences regardless of case:
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