Things you should never do:

Make your own load balancer software

Make firewall software

Make a date parsing library

Attempt to verify an email with a regular expression.

▲ 9dev 5 days ago | parent | next [-]

> Attempt to verify an email with a regular expression.

  .+@.+

That one always seemed sufficient for me, every issue after that is the users problem

	▲	jedberg 5 days ago \| parent \| next [-]
		Obviously there is a bit of nuance here, but the best rule of thumb is use a regex and then warn the user that it doesn't look valid but still accept it if it doesn't pass, and then send an email to verify it.
	▲	1718627440 2 days ago \| parent \| prev \| next [-]
		Except email addresses don't need to have an "@".
	▲	4 days ago \| parent \| prev [-]
		[deleted]

▲ the__alchemist 5 days ago | parent | prev | next [-]

Is parsing HTML with regexes Ok?

	▲	dimaaan 5 days ago \| parent [-]
		No. See https://stackoverflow.com/questions/1732348/regex-match-open...

▲ 9rx 5 days ago | parent | prev [-]

Roll your own encryption

Accept people's names

Anything