Web developers wiki ASP.NET Sitecore Sharepoint Kentico by Evident Interactive

Example: You want to have a maximum of three selections in a MultiList field.

Set the following Regular Expression in the "Validation" field of the Sitecore field (found in the template):

^(\|?\{a-fA-F0-9{8}-a-fA-F0-9{4}-a-fA-F0-9{4}-a-fA-F0-9{4}-a-fA-F0-9{12}\}\|?){0,4}$

This expression checks if there are valid GUIDS seperated by "|" characters. The {0,4} part defines how much items can be selected. In this case: no selection is allowed and a maximum of four items can be selected.

Alternative expression: ^(\*\}\|\{\*){0,3}$

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