Single quotes in worksheet names

Single quotes in worksheet names
20 April 2013

I was working on a function that uses regular expressions to determine whether a potential name for a workbook, worksheet or range contains illegal characters. I started by writing a little routine to determine which characters are illegal for sheet names. Of course, I could have just used one that I knew was prohibited and got the message below. But then I might never have thought about the use of single quotes in worksheet names.