Valid characters for Excel sheet names

Question

In Java, we\'re using the following package to programmatically create excel documents:

org.apache.poi.hssf

If you attempt to set a sheet\'

Answer 1

This is what I use in C# (should be similar in Java):

const string invalidCharsRegex = @"[/\\*'?[\]:]+";
const int maxLength = 31;

string safeName = Regex.Replace(worksheetName, invalidCharsRegex, " ")
                        .Replace("  ", " ")
                        .Trim();

if (string.IsNullOrEmpty(safeName))
{
    safeName = "Default";   // cannot be empty
}
else if (safeName.Length > maxLength)
{
    safeName = safeName.Substring(0, maxLength);
}