How to validate an email id in xml schema.

Question

Hi I have created a schema to check for email id. which can validate if the email id is [email protected] and [email protected] and [email protected] But i want to validate only [email protected] and [email protected] because i think email can have maximum 2 dots after @ symbol so the third one will be invalid email id So how to validate an email id using schema Below is the schema

<xsd:element name="SSEM" minOccurs="0">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element name="CNT" minOccurs="0" maxOccurs="unbounded">
                <xsd:complexType>
                    <xsd:sequence>
                        <xsd:element name="EM" minOccurs="1" nillable="true" type ="singleEmailID"/>
                    </xsd:sequence>
                </xsd:complexType>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

Thanks Sunil Kumar Sahoo

Answer 1

You will need to define a pattern to match against valid e-mails. Patterns are defined using regular expression syntax. Once you have defined a simple type (based on xs:string) with the appropriate pattern, you can use that for your e-mail type.

There are several places on the Internet that provide some examples of such types and patterns. An example of an e-mail type is provided here.

The example given there is as follows (I've edited it slightly to make things a little clearer):

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" > 

  <xsd:element name="A" type="emailAddress"/> 

  <xsd:simpleType name="emailAddress"> 
    <xsd:restriction base="xsd:string"> 
      <xsd:pattern value="[^@]+@[^\.]+\..+"/> 
    </xsd:restriction> 
  </xsd:simpleType> 
</xsd:schema>

Answer 2

You could use a <xs:simpleType> based on a string and with a regex pattern to validate your e-mail addresses:

<xsd:simpleType name="emailAddress">
    <xsd:restriction base="xsd:string">
        <xsd:pattern value="^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$"/>
    </xsd:restriction>
</xsd:simpleType>

Use any e-mail regex you like :-), see some samples on RegexLib.Net.

Then, use that type in your basic XML schema:

<xsd:element name="email" type="emailAddress" />

Answer 3

Use the below schema validator for email id validation