Email validating regular expression
And i If you need to validate users email addresses, consider sending them a verification to confirm that what they have given you is correct, but if you really want to be strict about things – consider a pre-built validation package. A very simple regular expression to validate that an email address generally fits the form required – now email your user and make sure they receive it! Last month I wrote about regular expressions in Java, today I’ll show you how to use regular expression in Java Script to validate email address.Here is the code to validate email address in Java Script using regular expression.: Finally, the email address must end with two to four alphabets.Having a-z and A-Z means that both lowercase and uppercase letters are allowed.indicates the minimum and maximum number of characters.Obviously this person will not get a validation email -- and in all likelihood will not be able to log in to his account when he returns.It's best to catch him when he's entering the information.
As such, I recommend using only a simple regular expression for this task.
The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise.
In bash speak true means it exits with a zero status, anything else is false.
At Ventata, we used to have the same issues you've all described with people forgetting things like ".com" and "gmial" vs "gmail".
Once we started using mailcheck our bounce rate went way down.
"Some people, when confronted with a problem, think ' I know, I'll use regular expressions.' Now they have two problems."——Jamie Zawinski on regular expressions; paraphrasing the Unix Haters Handbook on As @Simon pointed out, your regular expression might consider some valid addresses as invalid.