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extend "sasl.kerberos.principal.to.local.rules"  config rule format by supporting  "/L" (toLowerCase) at the end of the rule. However, it must be noted that this does not affect how pattern matches on input and therefore that will still be case-sensitive.

 For example, given the rules

"RULE:[2:$1@$0](joe-qa-.*@EXAMPLE.COM)s/.*/JOE-QA//L",
"RULE:[2:$1@$0](JOE-QA-.*@EXAMPLE.COM)s/.*/JOE-QA-UPPER//L",
"RULE:[2:$1@$0](.*@EXAMPLE.COM)s/@.*///L"

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