Article 6CQE0 Does lexer tool need be coded in the same language, as the source language?

Does lexer tool need be coded in the same language, as the source language?

by
ajiten
from LinuxQuestions.org on (#6CQE0)
What makes the need for Jflex, as a lexical analyzer building tool, for the Java language?
Why Flex is not enough for the same task?
Kindly explain with example of a Java language construct being unable to be tokenised using flex.

P.S.: Am a trainer, so please delve into details for the above, as there can be many questions asked for the above, to me.
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