カンマ区切りの正規表現（AAA,BBB,CCC,...）
^([^,]+,)+[^,]+$
カンマ区切り、コロン区切りの正規表現（AAA:AAA,BBB:BBB,CCC:CCC,...）
^([^,:]+:[^,:]+,)+[^,:]+:[^,:]+$
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