Issue in validating regular expression

I’m trying to validate emails for a sign up forum with JavaScript using regular expression, I’m trying to understand how they work using a website called RegExr that checks the output of your regular expression

Regular expression to validate email :

/^(([a-z][A-Z]-_\d])+@([a-z][A-Z])+\.([a-z][A-Z])+)$/

As you can see here it doesn’t work. Can someone help ?

>Solution :

1. you had ] at a place where it doesn’t belong here: \d].
2. for all letter it is [a-zA-Z] not [a-z][A-Z].
3. for the numbers in this case it is better to use [0-9]

Wat it should be:

^(([a-zA-Z0-9])+@([a-zA-Z])+\.([a-zA-Z])+)$

Note: an email address like this wont vallidate: jklm.qsdf@gmmail.com