DataAnnotations validation (Regular Expression) in asp.net mvc 4 – razor view

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UPDATE 9 July 2012 – Looks like this is fixed in RTM.

  1. We already imply ^ and $ so you don’t need to add them. (It doesn’t appear to be a problem to include them, but you don’t need them)
  2. This appears to be a bug in ASP.NET MVC 4/Preview/Beta. I’ve opened a bug

View source shows the following:

data-val-regex-pattern="([a-zA-Z0-9 .&amp;&#39;-]+)"                  <-- MVC 3
data-val-regex-pattern="([a-zA-Z0-9&#32;.&amp;amp;&amp;#39;-]+)"      <-- MVC 4/Beta

It looks like we’re double encoding.

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