validate email address

  • October 24th, 2007
  • by wanagi
  • php

Small function to validate an email address using preg_match. Returns TRUE if valid, false otherwise.

function is_valid_email($input) {
preg_match("^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@(([0-9a-zA-Z])+([-\w]*[0-9a-zA-Z])*\.)+[a-zA-Z]{2,9})$", $input)) 
}
(via http://stickandink.com/handy-php-functions-snippets?commented=1)

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This entry was posted on Wednesday, October 24th, 2007 at 10:27 am and is filed under php. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One comment to “validate email address”

  • February 12th, 2008
  • Freddy Bob
February 12th, 2008 at 12:03 am

I am afraid that your regular expression is not quite complete. This is the full regex as described by RFC 822:
(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()@,;:\\”.\[\] 00-37\177]+(?:(?:(?:\r\n)?[ \
t])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|”(?:[^\”\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:
\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\”.\[\] 00-37\177]+(?:(?
:(?:\r\n)?[ \t])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|”(?:[^\”\r\\]|\\.|(?:(?:\r\n)?[
\t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\”.\[\] 00-37
\177]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|\[(?:[^\[\]\r\\]|\\.)
*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\”.\[\] 00-37\1
77]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|\[(?:[^\[\]\r\\]|\\.)*\
](?:(?:\r\n)?[ \t])*))*|(?:[^()@,;:\\”.\[\] 00-37\177]+(?:(?:(?:\r\n)?[ \t
])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|”(?:[^\”\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\
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?:(?:\r\n)?[ \t])+|\Z|(?=[\[”()@,;:\\”.\[\]]))|\[(?:[^\[\]\r\\]|\\.)*\](?:(?:\
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