This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
The escape \A 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_194 RegexTest_195 RegexTest_196 RegexTest_197 RegexTest_198 RegexTest_199
Agreed that these patterns (and therefore these schemas) are invalid.