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ファイル名や拡張子のみなど取得

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var myFile = new File("/Desktop/abc.csv");

//GetFileName
function GetFileName(Num,FilePath){
    var returnStr="";
    var reg=/(.*)(?:\.([^.]+$))/;
    switch(Num){
        case 0 : returnStr = FilePath.name.match(reg)[0]; break; //abc.csv
        case 1 : returnStr = FilePath.name.match(reg)[1]; break; //abc
        case 2 : returnStr = FilePath.name.match(reg)[2]; break; //csv
    }
    return returnStr;
}
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