I wanted to get sub string

Question

Currently I am using code like this

    while (fileName.endsWith(".csv")) {
        fileName = fileName.substring(0, fileName.lastIndexOf(FILE_SUFFIX_CSV));
        if (fileName.trim().isEmpty()) {
            throw new IllegalArgumentException();
        }
    }

The above code works fine when user specifies extension in small letters(.csv),But windows accepts extensions case sensitive so he can give like .CsV ,.CSV etc. how can I alter above code ?

Thanks in Advance

Answer 1

why don't you turn it to lowercase?

while (fileName.toLowerCase().endsWith(".csv")) {
    fileName = fileName.substring(0, fileName.toLowerCase().lastIndexOf(FILE_SUFFIX_CSV));
    if (fileName.trim().isEmpty()) {
        throw new IllegalArgumentException();
    }
}