A String type custom attribute can have any value unless a regular expression constraint is specified in the OS Build Plan.

Constraints for a String custom attribute value:

Regular Expression

The specified value must match the regular expression. For example, a regular expression constraint ^[A-Za-z0-9]+$ implies that the custom attribute value must contain only uppercase alphabets, lowercase alphabets and numbers. To match the entire string, always remember to specify ^ as the starting character and $ as the ending character.

If left blank, the custom attribute value is not validated.


Can be up to 4095 characters in length.