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regexp

Multiple emails regexp

I need help to create a regular expression to validate an input which can be:

- null,
- one email address,
- multiple email separated by commas.

These should be valid:

Is there a way to handle multiple error messages in forms ?

I have a form with ValidationTextBox inputs like this one :

<input type="text" id="email"
    name="user.email" tabindex="4"
    dojotype="dijit.form.ValidationTextBox"
    required="true" trim="true"
    regexp="[a-zA-Z0-9_\x2D\x2E]+@[a-zA-Z0-9_\x2D\x2E]+\x2E[a-zA-Z]+"
    invalidmessage="Invalid email address." />
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