Input Validation - Multilanguage sites

[billy_zappa () yahoo com]

My question relates to Input Validation, especially when dealing with non-English character sets. The site I am working 
on will be written in classic ASP and will run on IIS 6.0.

I am familiar with input validation when dealing with English input/output. I have a couple of utility functions I use 
that either verify that the input is a number when it needs to be, or that it contains only "good" characters. By good 
characters, I mean letters, numbers, or one of the specifically allowed special characters, which I then encode. 
Example is a double quote, or single quote which I manually replace with the appropriate HTML entity.

So my question is how to handle this when dealing with another language, say Chinese as an example. Can all Chinese 
characters/symbols be considered safe? (I am primarily worrying about SQL Injection and/or Cross Site Scripting). When 
using Google Translator, it appears that most, if not all, English symbols are translated as the same symbols in 
Chinese. This includes a single quote, double quote, less than and greater than sign.

Or should I just use Server.HTMLEncode and be happy with that? In the past I liked having the ability to validate my 
input a little bit further through Regular Expression, but maybe this isn't an option when using other character sets.

I hope I explained what I am asking well enough. I look forward to any suggestions that can be offered. Thanks in 
advance for the help!

Jeff

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