Boolean
The Case switch determines if letter case is distinguished in searches.
The search functions that use the Case switch have “meta” forms that temporarily reverse the sense of the Case switch.
The Unixre and Case switches have no effect on the syntax of regular expressions used by the Build or Word switches. These switches always use case-sensitive UNIX regular expressions.
Case:{ yes | no }
yes
Case is significant in searches. Uppercase letters in search patterns do not match lowercase letters in text.
no
Case is not significant in searches. Uppercase letters match lowercase letters.
Case:no
Meta, Mgrep, Mreplace, Msearch, Psearch, Replace.