email validation with regular expressions

[jagdpenta]

hi all
once again this is jagdpenta

please give me this solution

email validation with php regular expressions

Thanks in advance

[etully]

preg_match("/^{([a-z0-9-]+)(.[a-z0-9-]+)@([a-z0-9-]+)(.[a-z0-9-]+)(.[a-z]{2,4})$/i",$email)}

[Weedpacket]

/(?:(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*")(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*"))*@(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\])(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\]))*|(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*")[^()<>\@,;:".\\\[\]\x80-\xff\000-\010\012-\037]*(?:(?:\([^\\\x80-\xff\n\015()]*(?:(?:\\[^\x80-\xff]|\([^\\\x80-\xff\n\015()]*(?:\\[^\x80-\xff][^\\\x80-\xff\n\015()]*)*\))[^\\\x80-\xff\n\015()]*)*\)+"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*")[^()<>\@,;:".\\\[\]\x80-\xff\000-\010\012-\037]*)*<(?:@(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\])(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\]))*(?:,@(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\])(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\]))*)*:)?(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*")(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|"[^\\\x80-\xff\n\015"]*(?:\\[^\x80-\xff] [^\\\x80-\xff\n\015"]*)*"))*@(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\])(?:\.(?:[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff])|\[(?:[^\\\x80-\xff\n\015\[\]]|\\[^\x80-\xff])*\]))*>)/

That should get you extra homework marks for thoroughness.

[Weedpacket]

quote=etully[/quote]You forgot ".museum" and ".travel".

[etully]

You forgot ".museum" and ".travel".

If you can honestly tell me that you have seen either of those TLD's used in real life (not specifically Googled for it), I will eat your silly propeller beanie.

[Weedpacket]

I guess no-one uses them because there are so many email address validators out there that don't believe in them.

To quote from O'Reilly's Perl Cookbook:

Problem
You want to find a pattern that will verify the validity of a supplied mail address.

Solution
There isn't one. You cannot do real-time validation of mail addresses. You must pick from a number of compromises.

Discussion
The common patterns that people try to use for this are all quite incorrect. As an example, the address fred&[e-mail] is valid and deliverable (as of this writing), but most patterns that allegedly match valid mail addresses fail miserably.

RFC-822 documents have a formal specification ... but that's still not good enough, for three reasons.

First, not all RFC-valid address are deliverable....

Second, some RFC-invalid addresses, in practice, are perfectly deliverable....

Thirdly and most important, just because the address happens to be both valid and deliverable doesn't mean that it's the right one....

But I'm not here to do the original poster's homework assignments.