note 13654 deleted from function.ereg-replace by jimw

I also came up with a regular expression to link email addresses, as they work a bit differently than normal URL's. ereg_replace('[A-Za-z0-9]([A-Za-z0-9._]*[A-Za-z0-9]|())@[A-Za-z0-9]([A-Za-z0-9.\-]*[A-Za-z0-9]|())\.[A-Za-z]+', '<a href="mailto:\\0">\\0</a>', $var); This one's a bit longer than my standard URL autolinker, as email addresses have many more restrictions associated with them. This code will allow any email address with periods or underscores in the account name (the part before the @), so long as they do not come first or next to the @, and with periods or hyphens in the domain name (the part after the @), so long as they do not come next to the @ or next to a period. Additionally, the domain name must include at least one period. Any surrounding punctuation like a period at the end of a sentence will not be included in the link. Therefore, the following would be autolinked: anon@internet.com anon.emoose@internet-mail.com anon_emoose@internet.mail.com However, the following would NOT be autolinked: anonymous anon.@internet.com anon@internet anon@.com anon@internet_mail.com anon@internet. .anon@internet.com Actually, I lied. Linking on the last one would occur, but only after the initial period. For all practical purposes, I believe this regular expression to be foolproof. Try it out, and see for yourself. By the way, you could also use the same regular expression to verify that a user has input a valid email address on a form, but you would want to anchor the expression to the beginning and end of the string.