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The escape \Z or \z 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_200 RegexTest_201 RegexTest_202 RegexTest_203 RegexTest_204 RegexTest_205 RegexTest_206 RegexTest_207 RegexTest_208 RegexTest_209 RegexTest_210 RegexTest_211 RegexTest_212 RegexTest_213 RegexTest_214 RegexTest_215 RegexTest_216 RegexTest_217 RegexTest_1000 RegexTest_1001 RegexTest_1002 RegexTest_1003 RegexTest_1004 RegexTest_1484 RegexTest_1485 RegexTest_1486 RegexTest_1487 RegexTest_1488
Agreed that these patterns (and therefore these schemas) are invalid.