Use the
CASE modifier with the WORD or WILDCARD operator to perform a case-sensitive search, based on the case of the word or phrase specified. The CASE modifier is not valid with the SOUNDEX and STEM operators. CASE modifier, you simply enter the search word or phrase as you wish it to appear in retrieved documents - in all uppercase letters, in mixed uppercase and lowercase letters, or in all lowercase letters.
When mixed uppercase and lowercase characters are included in a query, the search engine finds case-sensitive matches.