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The regex syntax is presented as a set of modifications to XSD production rules. It is confusing to have two modifications of rule [9] without showing the combined effect of the two changes. Also the rules need to be checked against XSD 1.1, for example to see if production numbers have changed.
I have fixed these two problems editorially. I have combined the two changes to the "atom" production and show the combined effect on both the XSD 1.0 and XSD 1.1 versions of the production (which are only editorially different). Similarly, for the change to Char, CharClass, quantifier and SingleCharEsc I have referenced the corresponding change to the XSD 1.1 baseline. (There are essentially no differences in the regex language accepted by XSD 1.1 and XSD 1.0, but the rules have been slightly refactored.)