Get suffix from a string as int-CodePudding

I've got a list containing file information on a remote server. The files on this server have a certain file name with a suffix that increments and is always 9 characters long:

20220123SOMENAME000000001
20220132SOMENAME000000002
20220201SOMENAME000030000
20220202SOMENAME000030002

I'm trying to create a method that takes the string above as input and returns an int (1, 2, 30000 and 30002) from the examples above.

public int GetCounterFromFileName(string fileName)
{
    // some logic extracting the index.

    int index = 0;

    return index;
}

Should I use regex to delete the prefix and infix and then get the index from the suffix?

CodePudding user response：

You can convert the last nine digits of the filename to integer by:

public int GetCounterFromFileName(string fileName)
{
    return Convert.ToInt32(fileName[^9..]);
}

CodePudding user response：

I'd use substring to cut out the last nine characters, and then parse them to an int:

public int GetCounterFromFileName(string fileName)
{
    return int.ParseInt(fileName.Substring(fileName.Length - 9));
}