Why am I getting different validation between an XSD regex with Nokogiri and normal Ruby regular expressions? -

i have xsd schema includes rule specific field match following regex:

\d{8}[\-]?[a-za-z]{0,3} 

using irb, can test regex , following strings match, correct:

12345678 12345678- 12345678-abc 12345678abc 

when attempt validate xml against xsd, different behaviour:

passes: 12345678- 12345678-abc 12345678abc  fails: 12345678 

and here mimimal xsd/xml files reproduces this:

<?xml version="1.0" encoding="utf-8"?> <xs:schema attributeformdefault="unqualified" elementformdefault="qualified" xmlns:xs="http://www.w3.org/2001/xmlschema">  <xs:simpletype name="codetype">   <xs:restriction base="xs:token">    <xs:pattern value="\d{8}[\-]?[a-za-z]{0,3}"/>   </xs:restriction>  </xs:simpletype>  <xs:element name="test">   <xs:complextype>    <xs:sequence>     <xs:element type="codetype" name="code"/>    </xs:sequence>   </xs:complextype>  </xs:element> </xs:schema> 

and xml:

<?xml version="1.0" encoding="utf-8"?> <test>   <code>11034755</code> </test> 

and running with

xmllint --schema test.xsd test.xml 

gives

element 'code': [facet 'pattern'] value '11034755' not accepted pattern '\d{8}[\-]?[a-za-z]{0,3}' 

while xml schema not have full regular expressions, should valid think. not understanding when comes regular expressions in xsd files in particular case regards '?' ?

using rubular test /\d{8}-?(?:[a-za-z]{3})?/ hits strings.

alternately /\d{8}[a-za-z-]*/, /\d{8}[a-z-]*/i, , /\d{8}[a-z-]{0,4}/i work also.

you can use {0,3} or {,3} might help.