i'm configuring a perl search engine on a friends site. in the config file it asks for a list of content types that the search engine should index (text/html, text/plain, application/pdf, etc). as most of the files have a php extension, what content type do i need to add so that the search engine crawls through them too?
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: