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https://issues.apache.org/jira/browse/XMLBEANS-412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875549#action_12875549
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Peter Keller commented on XMLBEANS-412:
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For additional clarity (I hope):
A positive char group is:
posCharGroup ::= ( charRange | charClassEsc )+
and '\-' is a valid charClassEsc, so using '\-' is valid via the charClassEsc
branch. The following four positive character groups are all valid and
equivalent:
[A-F0-9.+-] ('-' is a valid charRange here)
[-A-F0-9.+] ('-' is a valid charRange here)
[A-F0-9.+\-] ('\-' is a valid charClassEsc)
[\-A-F0-9.+] ('\-' is a valid charClassEsc)
The following two negative character groups are valid and equivalent:
[^A-F0-9.+\-] ('\-' is a valid charClassEsc)
[^\-A-F0-9.+] ('\-' is a valid charClassEsc)
and the following two are invalid:
[^A-F0-9.+-] ('-' is not a valid charRange here)
[^-A-F0-9.+] ('-' is not a valid charRange here)
> CLONE -Pattern facet regex requires dash - to be escaped
> --------------------------------------------------------
>
> Key: XMLBEANS-412
> URL: https://issues.apache.org/jira/browse/XMLBEANS-412
> Project: XMLBeans
> Issue Type: Bug
> Components: Validator
> Affects Versions: Version 2, Version 2.1, Version 2.2, Version 2.2.1,
> Version 2.3, Version 2.3.1
> Environment: Win 2000, JDK1.5
> Reporter: Radosław Ceszkiel
> Fix For: Version 2
>
>
> Given the following xsd that should allow only a valid email address pattern:
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
> <xsd:element name="Email" type="EmailType" />
> <xsd:simpleType name="EmailType" >
> <xsd:restriction base="xsd:token">
> <xsd:pattern
> value="([\.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(([a-zA-Z0-9_-])*\.([a-zA-Z0-9_-])+)+"/>
> </xsd:restriction>
> </xsd:simpleType>
> </xsd:schema>
> Using the following simple xml instance:
> <Email>t...@test.com</Email>
> Running:
> validate sample.xsd sample.xml
> generates:
> Schema invalid:
> D:\sample.xsd:7: error: pattern-regex: The regular expression
> '([\.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(([a-zA-Z0-9_-])*\.([a-zA-Z0-9_-])+)+' is
> malformed: '-' is an invalid character range. Write '\-'.
> A dash at the end or at the beginning of a character range does not have to
> be escaped (see
> http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/datatypes.html#nt-charRange
> "The - character is a valid character range only at the beginning or end of
> a - positive character group- .")
> The regular expression in the email example is a valid xsd regexp and should
> be accepted by the XmlBeans validator.
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