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 is an option for StringPosition, StringReplace, Find and FindList.
IgnoreCase in no way affects the parsing of Mathematica expressions.
See the Mathematica book: Section 2.7.2.
See also: ToUpperCase, ToLowerCase, SpellingCorrection.
This gives the positions in the string where the letter s occurs, regardless of case.
In the first case only those strings that match explicitly are replaced; in the second any string that matches, ignoring case, will be replaced.
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