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Somewhat unrelated, but out of curiosity, does anyone know of a site that lists — for all popular languages — various libraries/code snippets/routines which one

by asdfs 13y ago

Somewhat unrelated, but out of curiosity, does anyone know of a site that lists — for all popular languages — various libraries/code snippets/routines which one can use to correctly (according to the RFCs) check the validity of e-mail addresses? If not I may be compelled to create one.

taproot 13y ago
There isn't. Look up the regex for validating an email address it you'd like to know why.
computer 13y ago
Just send an email and see if it arrives.
jabr 13y ago
/.@./ is pretty much the best you can do. And even the dots are a bit iffy.
rmc 13y ago
The RFC-compliant email address is actually incredibly complex. There are loads of things that are RFC-valid email addresses that basically hardly anyone uses (like spaces).
callahad 13y ago
The HTML5 standard actually defines a mostly-sane regex, which achieves that sanity through "a willful violation of RFC 5322, which defines a syntax for e-mail addresses that is simultaneously too strict (before the "@" character), too vague (after the "@" character), and too lax (allowing comments, whitespace characters, and quoted strings in manners unfamiliar to most users) to be of practical use here." I like it. Link: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#valid-e-mail-address http://www.whatwg.org/specs/web-apps/current-work/multipage/...
mason240 13y ago
@"^[^@]{1,}[@]{1}[^@]{1,}\.{1}[^@]{1,}$" I check it with this RegEx to make sure it's in the right format of [string]@[string].[string] to make sure that user at least tries to enter an email address, but beyond that sending and email and getting a response is the only way.
- drdaeman 13y ago
  > @"^[^@]{1,}[@]{1}[^@]{1,}\.{1}[^@]{1,}$" Is not > [string]@[string].[string] It's mere ^.+@.+\..+ (in both POSIX extended and PCRE dialects) that properly represents the latter. And even such regexp filters out many technically-valid but obscure cases of RFC-compliant email addresses (for example ai, io, kh and ws TLDs have MX records, and supposedly hostmaster@io should be a valid email address).
neurostimulant 13y ago
Check out this incredibly complex rfc822 regex in action: http://regex101.com/r/fZ6cD5 http://regex101.com/r/fZ6cD5

by asdfs 13y ago

taproot 13y ago

There isn't. Look up the regex for validating an email address it you'd like to know why.

computer 13y ago

Just send an email and see if it arrives.

jabr 13y ago

/.@./ is pretty much the best you can do. And even the dots are a bit iffy.

rmc 13y ago

The RFC-compliant email address is actually incredibly complex. There are loads of things that are RFC-valid email addresses that basically hardly anyone uses (like spaces).

callahad 13y ago

The HTML5 standard actually defines a mostly-sane regex, which achieves that sanity through "a willful violation of RFC 5322, which defines a syntax for e-mail addresses that is simultaneously too strict (before the "@" character), too vague (after the "@" character), and too lax (allowing comments, whitespace characters, and quoted strings in manners unfamiliar to most users) to be of practical use here." I like it. Link: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#valid-e-mail-address http://www.whatwg.org/specs/web-apps/current-work/multipage/...

mason240 13y ago

@"^[^@]{1,}[@]{1}[^@]{1,}\.{1}[^@]{1,}$" I check it with this RegEx to make sure it's in the right format of [string]@[string].[string] to make sure that user at least tries to enter an email address, but beyond that sending and email and getting a response is the only way.

drdaeman 13y ago
> @"^[^@]{1,}[@]{1}[^@]{1,}\.{1}[^@]{1,}$" Is not > [string]@[string].[string] It's mere ^.+@.+\..+ (in both POSIX extended and PCRE dialects) that properly represents the latter. And even such regexp filters out many technically-valid but obscure cases of RFC-compliant email addresses (for example ai, io, kh and ws TLDs have MX records, and supposedly hostmaster@io should be a valid email address).

neurostimulant 13y ago

Check out this incredibly complex rfc822 regex in action: http://regex101.com/r/fZ6cD5 http://regex101.com/r/fZ6cD5