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Why is \/ invalid in a regular expression?

• From: Roger L Costello <costello@mitre.org>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Tue, 20 Apr 2021 18:46:11 +0000

Hi Folks,

The following simpleType is invalid:

    <xs:simpleType name="test">
        <xs:restriction base="xs:string">
            <xs:pattern value="([A-Z\/]{2,4})" />
        </xs:restriction>
    </xs:simpleType>

Why is the simpleType invalid? Because the regex in the pattern facet is invalid.

Why is the regex invalid? Because a backslash preceding a forward slash is invalid, i.e., \/ is invalid.

Why is \/ invalid? I have no idea. Anyone know why?

/Roger

• Follow-Ups:
  • Re: Why is \/ invalid in a regular expression?
    • From: Amelia A Lewis <amyzing@talsever.com>
  • Re: Why is \/ invalid in a regular expression?
    • From: David Carlisle <d.p.carlisle@gmail.com>