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The escape \xXX is not allowed in the XML Schema regular expression syntax. The following tests in TestSet MS-Regex2006-07-15 break this rule. The tests are wrongly described as valid. RegexTest_57 RegexTest_163 RegexTest_164 RegexTest_165 RegexTest_166 RegexTest_167 RegexTest_168 RegexTest_169 RegexTest_170 RegexTest_171 RegexTest_172 RegexTest_173 RegexTest_174 RegexTest_440 RegexTest_518
Agreed that these patterns (and therefore these schemas) are invalid.
RegexTest_440 data has the bug, but no test in the metaData actually refers to it as far as I can tell