What should I put in "Pattern" field of a Datatype resource?

The ultimate guide only says:

Pattern. Similar to a format mask: the user’s entry must match it.

Is this really a field for a mask or should it be a regular expression? I tryed to use the regex \d\d for a text datatype, and it almost worked. I say almost because the empty string is not being rejected. 

gustavofarias's picture
Joined: May 22 2012 - 7:10am
Last seen: 3 days 1 hour ago

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