在Scala中验证电子邮件一行

Adding simple e-mail validation to my code, I created the following function:

在我的代码中添加简单的电子邮件验证，我创建了以下函数：

def isValid(email: String): Boolean = if("""(?=[^\s]+)(?=(\w+)@([\w\.]+))""".r.findFirstIn(email) == None)false else true

This will pass emails like [e-mail] and fail mails like bobtestmymail.com, but mails with space characters slip through, like bob @testmymail will also return true.

这将传递像[e-mail]这样的电子邮件和bobtestmymail.com之类的邮件失败邮件，但是带有空格字符的邮件会漏掉，比如bob @testmymail也会返回true。

I'm probably being silly here...

我可能在这里很傻......

3 个解决方案

#1

As I've tested your regex and it was catching simple emails, I then checked your code and saw that you're using findFirstIn. I believe that is your problem. findFirstIn will jump all the spaces until it matches some sequence anywhere in the string. I believe that in your case it's better to use unapplySeq and check if it returns Some List

当我测试你的正则表达式并且正在捕捉简单的电子邮件时，我检查了你的代码，发现你正在使用findFirstIn。我相信这是你的问题。 findFirstIn将跳转所有空格，直到它匹配字符串中任何位置的某个序列。我相信在你的情况下，最好使用unapplySeq并检查它是否返回Some List

def isValid(email: String): Boolean =
   if("""(?=[^\s]+)(?=(\w+)@([\w\.]+))""".r.findFirstIn(email) == None)false else true

def isValid2(email: String): Boolean =
  """(\w+)@([\w\.]+)""".r.unapplySeq(email).isDefined

isValid("[e-mail]")                        //> res0: Boolean = true

isValid("t es t@gmailcom")                       //> res1: Boolean = true

isValid("b ob @tes tmai l.com")                  //> res2: Boolean = false

isValid2("[e-mail]")                       //> res3: Boolean = true

isValid2("t es t@gmailcom")                      //> res4: Boolean = false

isValid2("b ob @tes tmai l.com")                 //> res5: Boolean = false

// but those don't work for both:
// I recommend you using a proper regex pattern to match emails
isValid("test@gma.i.l.c.o.m")                    //> res6: Boolean = true

isValid("test@gmailcom")                         //> res7: Boolean = true

isValid2("test@gma.i.l.c.o.m")                   //> res8: Boolean = true

isValid2("test@gmailcom")                        //> res9: Boolean = true

#2

My function is inspired from the one that the Play Framework uses (see PlayFramework) and uses the regexp presented here: W3C recommendation. Hope it helps. All tests suggested in the other questions are passed.

我的功能灵感来自Play Framework使用的功能（请参阅PlayFramework）并使用此处提供的正则表达式：W3C推荐。希望能帮助到你。其他问题中建议的所有测试均通过。

private val emailRegex = """^[a-zA-Z0-9\.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$""".r


def check(e: String): Boolean = e match{
    case null                                           => false
    case e if e.trim.isEmpty                            => false
    case e if emailRegex.findFirstMatchIn(e).isDefined  => true
    case _                                              => false
}

#3

scala> def isValid(email : String): Boolean = if("""^[-a-z0-9!#$%&'*+/=?^_`{|}~]+(\.[-a-z0-9!#$%&'*+/=?^_`{|}~]+)*@([a-z0-9]([-a-z0-9]{0,61}[a-z0-9])?\.)*(aero|arpa|asia|biz|cat|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|[a-z][a-z])$""".r.findFirstIn(email) == None)false else true
v: (email: String)Boolean

scala> isValid("""[e-mail]""")
res0: Boolean = true

scala> isValid("""bob @test.com""")
res1: Boolean = false

scala> isValid("""bobtest.com""")  
res2: Boolean = false