Matching email addresses using regex in Javascript

I am encountering an issue with the else if block in my Javascript code. It seems to be blocking all email IDs, even correct ones. Can someone assist with understanding what the match() function returns?

I have tested the following scenarios:

- Empty field: working fine - Incorrect email ID: working fine - Correct email ID: not working

var pattern = new RegExp("/^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/");
   if(!accountantEmail){
       $("#infoTextMsg").hide();
       $("#accountantEmailNoDataErr").show();
       $("#accountantEmailInvalidFormat").hide();
       $("#accountant_email").focus();
       return false;
   }
   else if(!(pattern.test(accountantEmail))){
       $("#accountantEmailInvalidFormat").show();
       $("#infoTextMsg").hide();
       $("#accountantEmailNoDataErr").hide();
       $("#accountant_email").focus();
       return false;
   }

Answer №1

The function Javascript match() will provide an array with all the matching instances.

Take a look at the regex I have specified:

var pattern = "[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+\.[a-zA-Z]{2,4}";

if(!(accountantEmail.match(pattern))) {
    return false;
}

Answer №2

When it comes to validating data, it's recommended to use the RegExp#test function.

var emailPattern = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;

if (!emailPattern.test(userEmail)) {
    $("#userEmailInvalidFormat").show();
    $("#infoTextMsg").hide();
    $("#userEmailNoDataErr").hide();
    $("#email_input").focus();
    return false;
}

It's worth noting that the match function is more suitable for capturing groups in regular expressions.

Additionally, avoid adding slashes at the beginning of your pattern definition unless you're using a string representation of RegExp.

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