I was using a RegularExpression Validator in my ASP.NET MVC app but it wasn't having any of it. I was looking at "A-Z" etc thinking IT IS THE RIGHT ORDER!
Turns out it is because I have a hyphen in another part of my regex expression. The one after the underscore.
Solution
Turns out hyphens have to appear at either the front or the end of the regular expression - or be escaped with a\. So now I have updated my regular expression from[RegularExpression(@"[A-Za-z0-9_- %]+\.(bmp|jpg|jpeg|gif|png)")]to
[RegularExpression(@"[A-Za-z0-9_ %-]+\.(bmp|jpg|jpeg|gif|png)")]
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