I am looking to setup a local web server. The application uses PHP7 and Mysql. Do you have any recommendations for a server?
I have tried apache but there was an issue getting other computers on the lan to access it.
If your operating system is Windows you are looking at a WAMP setup: Windows + Apache + MySQL + PHP, you can get few pre-configured All-in-one solutions, for Windows I can recommend AMPPS: http://alternativeto.net/software/ampps/
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: