[Thai Details]

Additional validation rules for Thai:

 References for contextual rules

 RFC 5891: Internationalized Domain Names in Applications (IDNA): Protocol
    (proposed standard), http://tools.ietf.org/html/rfc5891

 .SCB IDN Registration Policy by Thai Name Server Co.,Ltd,
    https://www.nic.scb/docs/scb/SCB_IDN_Policy.pdf

 Code point                  Description of rule/Reference

 U+002D                      Label must neither start nor end with U+002D.
    HYPHEN-MINUS     Label  must not have U+002D in both third and fourth
                             position. RFC 5891 (sec 4.2.3.1)

 U+0E31, 0E34..0E3A,         Not in initial position. RFC 5891 (4.2.3.2).
 0E46..0E4D
    Marks and Modifier
    Letter

 U+0E40..0E44                  Must be directly followed by a code point of
    Leading Vowels          0E01..0E2E.

 U+0E31, U+0E34..U+0E37,     Must be directly preceded by a code point of
 U+0E47, U+0E4C..U+0E4D      0E01..0E2E.
    Upper Vowel Symbol
    and Upper Diacritics

 U+0E48..0E4B      Must be directly preceded by a code point of
    Tone Marks               0E01..0E2E or U+0E31, U+0E34..U+0E37.
                             Must not be followed by a
                             code point of U+0E31, U+0E34..U+0E37, U+0E47,
                             U+0E4C..U+0E4D.

 U+0E30, U+0E32      Must be directly preceded by a code point of
    Following Vowels         0E01..0E2E or a code point of U+0E31,
                             U+0E34..U+0E37, U+0E47, U+0E4C, U+0E4D or a
                             code point of 0E48..0E4B.

U+0E45     Must be directly preceded by a code point of
	    	     U+0E24 or U+0E26

 U+0E38..U+0E3A              Must be directly preceded by a code point of
    Lower Vowel Symbols      0E01..0E2E or a code point of U+0E31,
                             U+0E34..U+0E37, U+0E47, U+0E4C, U+0E4D or a
                             code point of 0E48..0E4B.

 Additionally, Thai labels cannot contain both European and Thai digits.

A max of 40 allocatable labels are allowed.