Validating an email address
If your customers sign up for your email list or newsletter, send them an email that requests them to validate by responding.
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For example, an email address will often have noreply somewhere in it.
If you are a developer of "web applications", you probably have written (or copy-pasted) some code which tries to validate an entered e-mail address.
I just thought this might come in handy for some of you.
Validating email address using regular expressions is tricky and is often not recommended. A valid email address as defined by RFC 2822 can be quite complex.
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If someone types an @ symbol sometimes that’s good enough. This will match every one of the examples up above and is fast. You could use it but why risk having a valid email address be rejected. Here is some data on what we’ve seen for email address lengths for real people when parsing emails: If you built your email validation rule to validate that an email address is at least 7 characters, that would be a pretty good rule.