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A comment on Ask HN: How do you split strings (to get keywords)?.

Re:Ask HN: How do you split strings (to get keywords)? by mbrubeck on Thursday July 30, 2009 @07:22PM (#733316)
"Second trial, you use a alpha-numeric whitelist and split on anything else, but what about umlauts? What about hebrew or cyrillic?"

A multi-lingual version of this could use the Unicode "General Category" character classes (Letter, Mark, Number, Punctuation, Symbol, Separator, Other).

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