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regexjsf-2primefacesemail-validation
Nidheesh
Nidheesh

Reputation: 4562

Email validation using regular expression in JSF 2 / PrimeFaces

I have an input field taking an email address:

<h:inputText value="#{register.user.email}" required="true" />

How can I validate the entered value as a valid email address using regex in JSF 2 / PrimeFaces?

Upvotes: 34

Views: 54466

Answers (5)

m_davari
m_davari

Reputation: 3

<p:inputText id="email" required="true" label="email" size="40"
    requiredMessage="Please enter your email address."
    validatorMessage="Invalid email format"
    value="#{userBean.email}">

  <f:validateRegex
    pattern="^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$" />

</p:inputText>
<p:watermark for="email" value="Email Address *" />
<p:message for="email" />

<p:commandButton value="test" style="margin:20px"
    action="#{userBean.register}" ajax="false" />

Upvotes: 0

Tere Hommikust
Tere Hommikust

Reputation: 51

This one supports unicode domain names in email:

<f:validateRegex pattern="^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[\p{L}\p{M}\p{N}.-]*(\.[\p{L}\p{M}]{2,})$" />

... and this one validates email only when email is entered (email is not required field in form):

<f:validateRegex pattern="(^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[\p{L}\p{M}\p{N}.-]*(\.[\p{L}\p{M}]{2,})$)?" />

Upvotes: 1

BalusC
BalusC

Reputation: 1108742

All regular expression attempts to validate the email format based on Latin characters are broken. They do not support internationalized domain names which were available since May 2010. Yes, you read it right, non-Latin characters are since then allowed in domain names and thus also email addresses.

That are thus extremely a lot of possible characters to validate. Best is to just keep it simple. The following regex just validates the email format based on the occurrence of the @ and . characters.

<f:validateRegex pattern="([^.@]+)(\.[^.@]+)*@([^.@]+\.)+([^.@]+)" />

Again, this just validates the general email format, not whether the email itself is legit. One can still enter [email protected] as address and pass the validation. No one regex can cover that. If the validity of the email address is that important, combine it with an authentication system. Just send some kind of an activation email with a callback link to the email address in question and let the user login by email address.

Upvotes: 54

mkyong
mkyong

Reputation: 2289

Here's my version and it works well :

<f:validateRegex pattern="^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$" />

And i made a demo here

Upvotes: 10

Daniel
Daniel

Reputation: 37061

Here is how:

Using it myself...

<h:inputText id="email" value="#{settingsBean.aFriendEmail}" required="true" label="Email" validatorMessage="#{settingsBean.aFriendEmail} is not valid">
    <f:validateRegex pattern="[\w\.-]*[a-zA-Z0-9_]@[\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]" />
</h:inputText>
<p:message for="email" />

Daniel.

Upvotes: 48

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