August 2018
Beginner
414 pages
3h 16m
English
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Chapter #37. Don't Attempt to Validate Email Addresses
Your user is entering an email address and you're thinking about writing some code to validate it (check that it's in a sensible format and they haven't entered gibberish or mistyped it). Think again.
It used to be so simple to validate email addresses on the client side. A little bit of JavaScript was all it took to check that the domain was in the format:
user@domain.tld
If it didn't match this pattern, it wasn't a valid email and the user couldn't sign up. We used to only have a handful of top-level domains (TLDs). Now, we have over 1,000 TLDs, with more being added all the time:
stealthy+user@example.ninja
stealthy+user@example.ninja
holidays@.ws
email@www.co
website@email.website
The above ...