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Think about it this way: I register for your website under the email address . That’s probably going to bounce off of the illustrious mail daemon, but the formatting is fine; it’s a valid email address.

To fix this problem, you implement an activation system where, after registering, I am sent an email with a link I must click.

Putting the value of the subject IP address inside parenthesis and assigning it to itself thereby turns it into an array where each dot separated number is assigned to an array slot.

Note that there's no need to test that the numbers are greater than or equal to zero because the regular expression test has already eliminated any thing that doesn't consist of only dots and digits.

In bash speak true means it exits with a zero status, anything else is false.

The status of a command/function is stored in the bash variable "$? variable so that rather than parsing words as whitespace separated items, bash parses them as dot separated.

Each of the four numbers has a valid range of 0 to 255.

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At this point, why keep parsing email addresses for their format? They can get ridiculously convoluted as in the case above and, according to the specification, are often too strict anyway. If you actually check the Google query I linked above, people have been writing (or trying to write) RFC-compliant regular expressions to parse email addresses for years.Generally great plugin, but this one is a deal breaker - I would prefer to validate only when triggered manually, i.e.before clicking the submit button or leaving the field. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).Validating a phone number using regular expression is tricky because the phone number can be written in many formats and can have extensions also.