Regarding the thing that didn't work, did you leave something out from the code that you posted? The "non-working" definition for "InThaiLCons" makes a reference to a sub called "Thai::InThaiCons", but there is no such subroutine in the code you posted. Clearly, referring to a non-existent subroutine will lead to failure.

Based on what you've posted, it looks like you can simply define your three subsets of consonants explicitly (including your definition of "InThaiLCons" that does work), and then create an overall "InThaiCons" sub by adding together the three subsets: 

sub InThaiCons {
    return <<END;
+Thai::InThaiHcons
+Thai::InThaiMCons
+Thai::InThaiLCons
END
}

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In reply to Re^5: Creating new character classes for foreign languages by graff
in thread Creating new character classes for foreign languages by Polyglot

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