Re: Regular expression to match email address
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 50643
interpreted = N
texte = Marc Kaiwi wrote: > Does anyone have a good solid regular expression to match an email address? > The easiest way to test it is to attempt to use it in an e-mail message.It is not, in practice, possible to match all possible email addresses, since the schema (RFC-2822) is defined so vaguely. You can get a copy of Mastering Regular Expressions and see the discussion there. He comes up with a regex 4,724 bytes long, which ignores nested address comments (and requires all of the features of Perl's regex engine. Here's a link to the optimized code (in Perl): http://public.yahoo.com/~jfriedl/regex/code.htmlthat he developed for the First Edition of the book. The Second Edition has its own web site: http://regex.info/and I like the First Edition so much, I am planning on buying the Second for the new details he has added.The only foolproof way to see if an e-mail address is legitimate is to use a finite state machine encoding the RFC-2822 specs.John-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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Associated Messages, from the most recent to the oldest:
Marc Kaiwi wrote: > Does anyone have a good solid regular expression to match an email address? > The easiest way to test it is to attempt to use it in an e-mail message.It is not, in practice, possible to match all possible email addresses, since the schema (RFC-2822) is defined so vaguely. You can get a copy of Mastering Regular Expressions and see the discussion there. He comes up with a regex 4,724 bytes long, which ignores nested address comments (and requires all of the features of Perl's regex engine. Here's a link to the optimized code (in Perl): http://public.yahoo.com/~jfriedl/regex/code.htmlthat he developed for the First Edition of the book. The Second Edition has its own web site: http://regex.info/and I like the First Edition so much, I am planning on buying the Second for the new details he has added.The only foolproof way to see if an e-mail address is legitimate is to use a finite state machine encoding the RFC-2822 specs.John-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
John Peacock
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