Nestable comments make the grammar for email-addresses irregular (context-free). If you preclude comments however, the resulting grammar is regular. The primary definition allows for (folding) whitespace between lexical tokens (e.g. a @ b.com). Removing all folding whitespace results in a canonical form. This is the regex for canonical email addresses according to RFC 5322 (precluding … Read more
Here’s how you can approach this: HTML <p id=”emails”></p> JavaScript var text=”[email protected], “assdsdf” <[email protected]>, “rodnsdfald ferdfnson” <[email protected]>, “Affdmdol Gondfgale” <[email protected]>, “truform techno” <[email protected]>, “NiTsdfeSh ThIdfsKaRe” <[email protected]>, “akasdfsh kasdfstla” <[email protected]>, “Bisdsdfamal Prakaasdsh” <[email protected]>,; “milisdfsfnd ansdfasdfnsftwar” <[email protected]> datum eternus [email protected]”; function extractEmails (text) { return text.match(/([a-zA-Z0-9._+-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi); } $(“#emails”).text(extractEmails(text).join(‘\n’)); Result [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected] Source: Extract email from bulk text (with … Read more
An email address must not exceed 254 characters. This was accepted by the IETF following submitted erratum. A full diagnosis of any given address is available online. The original version of RFC 3696 described 320 as the maximum length, but John Klensin subsequently accepted an incorrect value, since a Path is defined as Path = … Read more
There is no point. Even if you can verify that the email address is syntactically valid, you’ll still need to check that it was not mistyped, and that it actually goes to the person you think it does. The only way to do that is to send them an email and have them click a … Read more
See RFC 5322: Internet Message Format and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol. RFC 822 also covers email addresses, but it deals mostly with its structure: addr-spec = local-part “@” domain ; global address local-part = word *(“.” word) ; uninterpreted ; case-preserved domain = sub-domain *(“.” sub-domain) sub-domain = domain-ref … Read more