[Cmake] Substitution or not between quotes?

[Martin Trudeau]

Hi.

Could anyone explain to me why 

#################
IF("y" MATCHES "^y$")
MESSAGE("match")
ELSE("y" MATCHES "^y$")
MESSAGE("no match")
ENDIF("y" MATCHES "^y$")
###################

produces the message "match" if y is not defined
but "no match" if it is. I thought there was never any
substitution taking place for strings between quotes, unless
${...} was used. So, if there is substitution, why and how?

Thanks.

-Martin
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