PHP の mb-extension

連想配列の添え字にマルチバイト文字が使えるのは mb-extension の機能と考えていいんだよな。でもこの値の判別について、正規表現マッチを行う場合は ereg でもいいんだろうか？（ereg はバイナリを通すのはまずい。）mbereg か preg の方が安全なのは分かるんだが。

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