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The escape \b or \B 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_218 RegexTest_220 RegexTest_221 RegexTest_222 RegexTest_226 RegexTest_230 RegexTest_232 RegexTest_233 RegexTest_516 RegexTest_524 RegexTest_594 RegexTest_595 RegexTest_596 RegexTest_597 RegexTest_598 RegexTest_599 RegexTest_600 RegexTest_601 RegexTest_602 RegexTest_603 RegexTest_604 RegexTest_605 RegexTest_640 RegexTest_773 RegexTest_1078 RegexTest_1079 RegexTest_1080 RegexTest_1081 RegexTest_1082 RegexTest_1083 RegexTest_1084 RegexTest_1085 RegexTest_1086 RegexTest_1087 RegexTest_1088 RegexTest_1089 RegexTest_1124 RegexTest_1257
640, 773, 1124, and 1257 should not be in this list: these use "a\\b" which is a valid regular expression. All the others are invalid.
Moved metadata for 640, 773, 1124, and 1257 back to stable per earlier decision