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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Using the question mark symbol in a simpleType - legaland
 On Thu, Dec 9, 2021 at 12:04 AM Roger L Costello <costello@mitre.org> wrote: The value of the pattern facet is a regular expression (regex) and the question mark is a reserved symbol (it is a meta-symbol). To indicate that we want the question mark (not the meta-symbol) we must escape it: With XML Schema 1.1, I sometimes prefer <xs:assertion test="matches(..)"/> over <xs:pattern value=".."/>, particularly for complex regexes. With XPath 2.0 fn:matches, we can use regex flags as defined by XPath 2.0 F&O spec (https://www.w3.org/TR/xquery-operators/#regex-syntax), to break long regex into multiple lines for readability. For e.g, translating above cited XSD simpleType would look like following (not tested) with
xs:assertion, <xs:simpleType name="Test2"> <xs:restriction base="xs:string"> <xs:assertion test="matches($value, 'A | B | \?', 'mx')" /> </xs:restriction> </xs:simpleType> (this can be even more helpful, when regexes are much more complex) Regards, Mukul Gandhi 
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