Restrict Text values through some rule on Text type product attribute?

Hi All ,

We had previously raised an : "SR #3-15131269331: Issue with Attribute Values Greater than 999" where we had Integer type attribute in use, but if were putting values greater that 999 it was coming in "1,000" format( comma after 1 ) instead of "1000" hence our calculation based on this field value was failing. 2 workarounds we had 1) to make attribute as type Text 2) To make Locale level changes.

We decided to go with option 1 as workaround and option 2 was not approved by client. Now problem is we have display name for same attribute as "Quantity" and we need to restrict the user to enter only Integer values. It is a strange case but like that only.