I have a free evaluation form that I want people to use, but I would like it to do two checks before sending the form:
1. Check the URLs entered are real websites
2. If a user enters a free email (hotmail, yahoo etc.) address, I would like to show an error message, asking them to use another address.
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HTML checkboxes provide the perfect way for a web developer to receive client input when the client's options might be none, one or many. But the PHP code for processing the checkboxes can be confusing at first. What if a checkbox is…
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: