email validation

[blanius]

Someone ask me if we could validate an email before submiting to the server script on an 3dfa form.... So here we go

errormsg=""//clear the error message if there is one
dot=email.indexOf(".",0)//find the dot

if (dot<1){//No dot?
    errormsg+="No dot\n"
    }
    else{//there is a dot but must have at least two chars after it
        ext=email.substr(dot+1)
        if (ext.length<2 || ext.length>3){
            errormsg+="Invalid Domain\n"
            }
    }
    
theat=email.indexOf("@",0)//find the at
if (theat<0){//no at?
 errormsg+="No @ \n"
}
else{//found at but is there at least one character in front of it?
    name=email.substr(0,theat)
        if (name.length<1){
            errormsg+="must have name\n"
            }
    }


trace (errormsg) 

Example
Source file