Thai question

[Venkateswaran I. <vi...@ac...>]

Hi=20

I had some general questions about Thai language rules. Would =
appreciate
some help in understanding which ICU APIs to use to get around the =
problem I
am facing.

Thai seems to allow some symbols to be used alongwith some Thai =
consonants
to make up a character. for eg : =B8=D1 is the first character of the =
month
December. It seems to be made up of 2 codepoints : 0x0E18 and 0x0E31.
However Unicode::isLetter() seems to return FALSE for the 2nd =
codepoint.=20

We have a requirement of validating strings against alphanumeric =
characters.
There are a range of codepoints in codepage 874 which return FALSE for
Unicode::isLetter() but can be used in conjunction with the other 44
consonants available in this codepage. Are there any ICU wrappers which =
will
help me in following these rules ?

Also I am totally ignorant about this language so my next question is : =
Can
any of these extra symbols be used with any other consonant or are =
there
rules which specify that only certain combinations would work ?

Any help more appreciated. Also pointers to some Thai resources would =
be
useful.

Thanks
Venkat