If they really want to load package Regexp::CharClasses::Thai from a file Regexp-CharClasses-Thai.pm, then the following should work:

BEGIN {
    require 'Regexp-CharClasses-Thai.pm'; # resp. ideally use the full
+ path
    Regexp::CharClasses::Thai->import('IsThaiDigit');
}

[download]

(see also use)

In reply to Re^8: Listing out the characters included in a character class [naming mismatch] by Corion
in thread Listing out the characters included in a character class by Polyglot

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