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Re:Working at Netflix by Gurkenmaster on Wednesday January 21, 2015 @05:01AM (#8922336)
Unrelated: In Unicode that would be a pretty difficult problem. The uppercase version of 'ß' is actually two characters "SS". There are a lot of messed up casing rules in the unicode standard. http://unicode.org/faq/casemap_charprop.html#11
Re:Working at Netflix by scatters on Wednesday January 21, 2015 @05:21AM (#8922387)
Sure, casing is complicated; but determining whether a codepoint has the uppercase property is easy - just use u_isUUppercase().

Where it does get complicated is determining whether a codepoint or a digraph of multiple codepoints is a letter, and that's culture-dependent; e.g. IJ in Dutch.