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Test reDG2 in testSet MS-Regex2006-07-15 uses the regex syntax pattern='\p{Nd}{4}-\[{Nd}{2}' which is invalid ({Nd} is not a valid quantifier) But the test is described as valid.
It appears that the intent of this test was to use the valid pattern pattern='\p{Nd}{4}-\p{Nd}{2}' in place of pattern='\p{Nd}{4}-\[{Nd}{2}' Fixed the schema to use the corrected pattern.