equalexperts / emailaddress

Micro-library for validating and obfuscating email addresses

Version Matrix




Scala micro-library for typing, validating and obfuscating email addresses

[Originally forked from hmrc/emailaddress]

Address Typing & Validation

The EmailAddress class will only accept valid addresses:

scala> import com.equalexperts.emailaddress._
import com.equalexperts.emailaddress._

scala> EmailAddress("example@test.com")
res0: com.equalexperts.emailaddress.EmailAddress = example@test.com

scala> EmailAddress("not_a_meaningful_address")
java.lang.IllegalArgumentException: requirement failed: 'not_a_meaningful_address' is not a valid email address

You can also use EmailAddress.isValid(...):

scala> EmailAddress.isValid("example@test.com")
res2: Boolean = true

scala> EmailAddress.isValid("not_a_meaningful_address")
res3: Boolean = false

Accessing the domain and mailbox

You can access the mailbox and domain of a given address:

scala> EmailAddress("example@test.com").domain
res0: com.equalexperts.emailaddress.EmailAddress.Domain = test.com

scala> EmailAddress("example@test.com").mailbox
res1: com.equalexperts.emailaddress.EmailAddress.Mailbox = example

These compare equal as you might expect:

scala> EmailAddress("example@test.com").domain == EmailAddress("another@test.com").domain
res2: Boolean = true

scala> EmailAddress("example@test.com").domain == EmailAddress("another@test.co.uk").domain
res3: Boolean = false


Addresses are obfuscated by starring out all of their mailbox part, apart from the first and last letters:

scala> ObfuscatedEmailAddress("example@test.com")
res4: com.equalexperts.emailaddress.ObfuscatedEmailAddress = e*****e@test.com

Unless there are only two letters:

scala> ObfuscatedEmailAddress("ex@test.com")
res7: com.equalexperts.emailaddress.ObfuscatedEmailAddress = **@test.com```

You can also create them directly from an EmailAddress:

scala> EmailAddress("example@test.com").obfuscated
res6: com.equalexperts.emailaddress.ObfuscatedEmailAddress = e*****e@test.com

Converting back to String

All classes toString and implicitly convert to Strings nicely:

scala> val someString: String = EmailAddress("example@test.com")
someString: String = example@test.com

scala> val someString = EmailAddress("example@test.com").toString
someString: String = example@test.com

scala> val someString: String = ObfuscatedEmailAddress("example@test.com")
someString: String = e*****e@test.com

scala> val someString = ObfuscatedEmailAddress("example@test.com").toString
someString: String = e*****e@test.com

scala> EmailAddress("example@test.com").domain.toString
res4: String = test.com

scala> val s: String = EmailAddress("example@test.com").domain
s: String = test.com

scala> EmailAddress("example@test.com").mailbox.toString
res5: String = example

scala> val s: String = EmailAddress("example@test.com").mailbox
s: String = example


Include the following dependency in your SBT build

resolvers += Resolver.bintrayRepo("equalexperts", "open-source")

libraryDependencies += "com.equalexperts" %% "emailaddress" % "<INSERT VERSION>"

Building with Docker

docker build -t emailaddress:latest .

Publishing with Docker

docker run -v ~/.ivy2:/root/.ivy2 -t emailaddress:latest


This code is open source software licensed under the Apache 2.0 License.