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Can some one provide a function which checks if a string is an email address?

Posted on 2006-11-22
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Last Modified: 2006-12-08
Hi Experts,

Can some one provide a function which checks if a string is an email address?

Thanks
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Question by:indyng
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7 Comments
 
LVL 30

Expert Comment

by:third
ID: 17995411
try,

function isValidEmail(str){
  var reEmail = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;  
  return reEmail.test(str);            
}
0
 
LVL 41

Expert Comment

by:HonorGod
ID: 17995844
 Since e-mail addresses can't start with a digit, I think this would be better:

  function validEmail( str ) {
    return /^[a-z_][a-z0-9_.-]*@[a-z0-9_.-]*(\.\w{2,7})+$/.test( str );
  }
0
 
LVL 1

Author Comment

by:indyng
ID: 17996397
How can I incorporate an error message? Thanks
0
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LVL 30

Accepted Solution

by:
third earned 800 total points
ID: 17996467

function isValidEmail(str){
  var reEmail = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;  
 
  if(!reEmail.test(str)){
    alert('Invalid email!');
    return false;
  }
  else{
    return true;
  }
}
0
 
LVL 23

Assisted Solution

by:rama_krishna580
rama_krishna580 earned 600 total points
ID: 17996806
Hi,

try this..

if (document.formname.fieldname.value.length >0) {
       i=document.formname.fieldname.value.indexOf("@")
       j=document.formname.fieldname.value.indexOf(".",i)
       k=document.formname.fieldname.value.indexOf(",")
       kk=document.formname.fieldname.value.indexOf(" ")
       jj=document.formname.fieldname.value.lastIndexOf(".")+1
       len=document.formname.fieldname.value.length

       if ((i>0) && (j>(1+1)) && (k==-1) && (kk==-1) && (len-jj >=2) && (len-jj<=3)) {
       }
       else {
             alert("Please enter an exact email address.\n" +
            document.formname.fieldname.value + " is invalid.");
            return false;
       }

 }
 
http://www.pantz.org/scripting/javascript/formvalidation.shtml

R.K
0
 
LVL 41

Assisted Solution

by:HonorGod
HonorGod earned 600 total points
ID: 17996814
 oops, forgot to add the case insensitivity

 function validEmail( str ) {
    return /^[a-z_][a-z0-9_.-]*@[a-z0-9_.-]*(\.\w{2,7})+$/.test( str );
  }
...

  Looking into "Mastering Regular Expressions" by Jeffrey Friedl, I find that something somewhat similar to the one supplied by third:

  /^\w[-.\w]*@[-a-z0-9]+(\.[-a-z0-9]+)*\.(com|edu|gov|int|mil|net|org|biz|info|name|museum|coop|aero|[a-z][a-z]$/i

  Which is right for you?  How "accurate" do you want your match to be?
0
 
LVL 41

Expert Comment

by:HonorGod
ID: 17996836
I "really did" put the trailing 'i' there... (sigh)

  return /^[a-z_][a-z0-9_.-]*@[a-z0-9_.-]*(\.\w{2,7})+$/i.test( str );
0

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