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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.

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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.

EXAMPLES

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Basic Examples (1)

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:

In[1]:=

Out[1]=

Use IgnoreCase->False to treat lowercase and uppercase letters as distinct letters:

In[2]:=

Out[2]=

Scope (3)

IgnoreCase is set to False by default:

Find positions of successive identical characters independent of case:

This replaces all occurrences regardless of case: