It is used by Rexeg. Try evaluating the following for a MNU.

'a' matchesRegexIgnoringCase: 'a'

which I guess can be fixed in the Regex package, or in Character
(since there's already a String>>sameAs:)

Character>>sameAs: aChar
sameAs: aCharacter 
	"Answer whether the receiver is equal to aCharacter, ignoring case"
	^ (self asLowercase = aCharacter asLowercase)	
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