Question

Email Validation - Regular Expression for valid characters!!!

Asked by: Svjetlana

Hi,

Can anyone tell me how to match the patern of the domain name that has "-" using the regular expression.

See the code bellow:

var myDomains="@test-testing.com;"
function checkEmailAddress(){
     if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.]*\w+)(@\w+[\w|\.]*\w+\.\w{2,3})/))
{
(myDomains.indexOf(emailParts[2]+';')>-1)) return true;
    else errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' +emailParts[2]);
     document.adduser.Email.focus(); }
     return false;
     }
     checkEmailAddress('');

Many thanks...

Svjetlana

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Asked On
2003-04-03 at 03:14:29ID20572818
Tags

email

,

regular

,

validation

,

expression

Topic

JavaScript

Participating Experts
3
Points
125
Comments
22

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Answers

 

by: avnerPosted on 2003-04-03 at 03:40:39ID: 8260588

Here is a working example :

<html>
<head>
<title>about:blank</title>
<script language="javascript1.2">
<!-- copyright(c) avcoh@yahoo.com

function checkEmailAddress(sEmail)
{
var oRegExp = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/g;
if (oRegExp.test(sEmail))
     {
          return true;
     }
     else
     {
    errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' +emailParts[2]);
    return false;
     }
 }

var sEmail="so-me@tes-ttesting.com"
 checkEmailAddress(sEmail);


-->
</script>
<style>

</style>
</head>
<body>

</body>
</html>

 

by: msa2003Posted on 2003-04-03 at 04:08:44ID: 8260695

Why not to use
/(\w+[\w|\.]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,3,4})/
?

{2, 4} because there is a top-level domain '.info' which contains four characters.

Also refer to http://wsabstract.com/javatutors/re2.shtml as a short regular expression reference.

Ñ íàèëó÷øèìè ïîæåëàíèÿìè
Serge

 

by: msa2003Posted on 2003-04-03 at 04:20:06ID: 8260742

typo.

/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/

 

by: cubrovicPosted on 2003-04-03 at 04:24:13ID: 8260759

Try change the r.e. part

[\w|\.]*   with [\w|\.|-]*

You have to do that on both place like

/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,3})/

 

by: SvjetlanaPosted on 2003-04-03 at 04:28:32ID: 8260768

avner

Right, but this wouln't stop any other email address (for example dsfsdf@dsfsdf-sdfasf.com to register. As it said int the error message "If you attempt to use any other email address your registration will not be accepted"  


msa2003

Thanks, I have tried this already, but this means that any email address can register containing "-". I just need to read domains from the list and any other that holds "-" should automatically bring error message.


Lana

 

by: avnerPosted on 2003-04-03 at 04:31:46ID: 8260783

Svjetlana ,
Did you mean you got error with "dsfsdf@dsfsdf-
sdfasf.com", It works fine for me.
And if you try :

@dsfsdf-sdfasf.com

Which is an invalid email address, then it fails.


 

by: SvjetlanaPosted on 2003-04-03 at 04:34:45ID: 8260793

avner

Right, but this wouln't stop any other email address (for example dsfsdf@dsfsdf-sdfasf.com to register. As it said int the error message "If you attempt to use any other email address your registration will not be accepted"  


msa2003

Thanks, I have tried this already, but this means that any email address can register containing "-". I just need to read domains from the list and any other that holds "-" should automatically bring error message.


Lana

 

by: SvjetlanaPosted on 2003-04-03 at 04:36:05ID: 8260801

cubrovic

Yes, but I can then do this and it will be accepted
sdfsdf@-.com


Yes, but I can then do this and it will not be accepted, even though this email should be accepted
sdfsdf@test-testing.com


 

by: SvjetlanaPosted on 2003-04-03 at 04:45:57ID: 8260849

avner

If the so-me@tes-ttesting.com should only be allowed not the dsfsdf@dsfsdf-sdfasf.com nor the @dsfsdf-sdfasf.com

Here is the full code:

<html>
<head>
<title>test</title>
<script language="javascript1.2">

function CheckForm () {

     var errorMsg = "";
     
          if (document.adduser.Email.value==""){
          errorMsg += "\nEmail - Please use this email address e.g. .If you attempt to use any other email address your registration will not be accepted for security treasons.";
     }

     
     if (document.adduser.Email.value.length >0 && (document.adduser.Email.value.indexOf("@",0) == -1||document.adduser.Email.value.indexOf(".",0) == -1)) {
          errorMsg +="\nEmail - \t\tEnter your Full Email Address";
     }
     
     if
 ((document.adduser.Email.value.indexOf("!",0) != -1)||(document.adduser.Email.value.indexOf("&",0) != -1)||
       (document.adduser.Email.value.indexOf("%",0) != -1)||
       (document.adduser.Email.value.indexOf("^",0) != -1)||
       (document.adduser.Email.value.indexOf("&",0) != -1)||
       (document.adduser.Email.value.indexOf("*",0) != -1)||
       (document.adduser.Email.value.indexOf("_",0) != -1)||    
       (document.adduser.Email.value.indexOf("+",0) != -1)||
       (document.adduser.Email.value.indexOf("=",0) != -1)||
       (document.adduser.Email.value.indexOf(",",0) != -1)||
       (document.adduser.Email.value.indexOf("?",0) != -1)||
       (document.adduser.Email.value.indexOf(":",0) != -1)||
       (document.adduser.Email.value.indexOf(";",0) != -1)||
       (document.adduser.Email.value.indexOf("'",0) != -1)||
       (document.adduser.Email.value.indexOf("~",0) != -1)||
       (document.adduser.Email.value.indexOf("#",0) != -1))
 
       {
          errorMsg +="\nEmail - \t\tInvalid Characters !£$%^&*_+=,?:;'~#";
     }
     
     
function checkEmailAddress(sEmail)
{
var oRegExp = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/g;
if (oRegExp.test(sEmail))
    {
         return true;
    }
    else
    {
   errorMsg +=('\nEmail - Please use this email address e.g. . If you attempt to use any other email address your registration will not be accepted for security treasons. Email not allowed: ' +emailParts[2]);
   return false;
    }
}

var sEmail="so-me@tes-ttesting.com"
checkEmailAddress(sEmail);

     if (errorMsg != ""){
          msg = "You have not fully completed the registration form. Please check your details and try again. \n";
          errorMsg += alert(msg + errorMsg + "\n\n");
          return false;
     }
     return true;
}
-->
</script>
</head>
<body>
<form name="adduser" method="post" action="test.asp" onSubmit="return CheckForm ()">
<input type="text" name="Email" id="Email" size="22" onBlur="">
<input type="submit" name="Submit" value="Register" OnClick="document.adduser.value = frames.document.body.innerHTML;" >
</form>
</body>
</html>

 

by: avnerPosted on 2003-04-03 at 04:54:10ID: 8260881

Svjetlana, please further explain :
Is this correct :

Accept :
so-me@tes-ttesting.com

Do not accpet :
dsfsdf@dsfsdf-sdfasf.com
@dsfsdf-sdfasf.com


Is that what you are saying ?

 

by: SvjetlanaPosted on 2003-04-03 at 04:58:50ID: 8260917

avner

yes.

 

by: msa2003Posted on 2003-04-03 at 05:10:09ID: 8261009

cuborvic: your sample EXACTLY duplicates my ;)

Strange. I tried this.
sdfsdf@-.com is not accepted,
sdfsdf@test-testing.com is succesfully accepted with my/cuborvics code.

Svetlana: I'm not sure I understand you. Couldn't you give more detailed description of what do you need?

As I understand, your script does the following: first, it checks if the string matches designed reqular expression, next it breaks the string apart according to the expression and looks if the right part contains an address at the right (';' is used to help do that).

I have a few ideas, but I need more information.

Serge
msa@dsip.net

P. S. Esli problemi s anglijskim, pishi po-russki

 

by: msa2003Posted on 2003-04-03 at 05:15:56ID: 8261057

var myDomains="@test-testing.com;"
function checkEmailAddress(){
    if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/))
{
if (myDomains.indexOf(emailParts[2].toLowerCase()+';')>-1)) return true;
   else errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' +emailParts[2]);
    document.adduser.Email.focus(); }
    return false;
    }
    checkEmailAddress('');

???

 

by: msa2003Posted on 2003-04-03 at 05:17:21ID: 8261067

var myDomains="@test-testing.com;"
function checkEmailAddress(){
    if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/))
{
if (myDomains.indexOf(emailParts[2].toLowerCase()+';')>-1) return true;
   else errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' +emailParts[2]);
    document.adduser.Email.focus(); }
    return false;
    }
    checkEmailAddress('');

???

 

by: msa2003Posted on 2003-04-03 at 05:19:46ID: 8261086

toLowerCase is used to accept the right e-mail ="test@tEst-testing.com;" for example (in the web there is no matter what is the letter's case).

 

by: SvjetlanaPosted on 2003-04-03 at 05:21:24ID: 8261099

msa2003

OK this is the scenario. The script checks if the string matches designed reqular expression:

var sEmail="so-me@tes-ttesting.com"

any other string SHOULD NOT be accepted. For example:

so-me@dfsdf-sdfsd.com, so-me@-.com,
sdfsdf@tes-ttesting.com, dsfasdf@sdfsd.com

thanks,

Svjetlana

p.s. ruski nepricam, sorry

 

 

by: msa2003Posted on 2003-04-03 at 05:22:40ID: 8261107

avner: \w is equal to [a-zA-Z0-9_]. Do not forget about '_' char which is allowed in the e-mail addresses.

Hope it is usefull
Serge
msa@dsip.net

 

by: msa2003Posted on 2003-04-03 at 05:27:03ID: 8261139

Should so-another@test-testing.com be accepted?

 

by: SvjetlanaPosted on 2003-04-03 at 05:32:16ID: 8261181

OK, let say so-another@test-testing.com could be accepted.

Svjetlana

 

by: SvjetlanaPosted on 2003-04-03 at 05:39:16ID: 8261243

msa2003
just tried your code:

 var myDomains="@test-testing.com;"
function checkEmailAddress(){
   if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/))
{
if (myDomains.indexOf(emailParts[2].toLowerCase()+';')>-1) return true;
  else errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' +emailParts[2]);
   document.adduser.Email.focus(); }
   return false;
   }
   checkEmailAddress('');

but somehow this email is accepted:@test-tes-ting.com ....

 

by: msa2003Posted on 2003-04-03 at 06:41:19ID: 8261740

var myDomains="@test-testing.com;"

function errorMessage(email)
{
  errorMsg +=('\nEmail - \t\t\Please use this email address e.g. . \n\t\tIf you attempt to use any other email address your registration will not be accepted for security \n\t\treasons. Email not allowed: ' + email);
  document.adduser.Email.focus();
}

function checkEmailAddress()
{
  if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/))
  {
    if (myDomains.indexOf(emailParts[2].toLowerCase()+';')>-1)
    {
      return true;
    } else
    {
      errorMessage(emailParts[2]);
      return false;
    }
  } else
  {
    errorMessage(document.adduser.Email.value);
    return false;
  }
}

:o)

 

by: SvjetlanaPosted on 2003-04-04 at 00:19:41ID: 8267898

Thank you msa2003 for all your help, I am accepting this answer. This would do just fine:

if(emailParts=document.adduser.Email.value.match(/(\w+[\w|\.|-]*\w+)(@\w+[\w|\.|-]*\w+\.\w{2,4})/))


Svjetlana

 

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