I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx..
Use Unix file format while saving Your script.
otherwise it will have ^M s or smth likely weird in the EOL,
Then DO NOT use m…
A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads), installed and started the daemon, and had a console window open.
After an hour or two of playing at the command …
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: