Extract email addresses from text

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Gustav Essunger 2017-6-8

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评论： Adam Danz 2021-6-2

Hello everyone!

Does anyone have a script (or know how to create one) that extracts email addresses from a text string?

(With similar function as this website: http://www.procato.com/mailextract/)

Thanks in advance! Gustav

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Steven Lord 2017-6-9

It's likely more complicated than you think. See for example this Microsoft blog and this Stack Overflow question. One of the answers on the Stack Overflow page links to a (five year old) page giving a regular expression that I suspect you could use with the regular expression functionality in MATLAB.

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Answer 1

Stephen23 2017-6-8

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编辑：Stephen23 2021-6-2

在 MATLAB Online 中打开

Take MATLAB's own Regular Expressions example:

email = '[a-z_]+@[a-z]+\.(com|net)';

and adapt it to allow any domain, or whatever other requirements you have:

rgx = '[a-z0-9_]+@[a-z0-9]+(\.[a-z0-9]+)+';
C = regexpi(txt,rgx,'match');

For a slightly stricter version, you can find many regular expressions on the internet, e.g.:

rgx = '[a-z0-9._%+-]+@[a-z0-9-]+(\.[a-z0-9-]+)+'

While this simple regular expression works for simple email adresses, it is worth noting that the complete rules for checking valid email adresses are not trivial to implement with a regular expression:

http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

https://www.emailregex.com

A common mistake (including by this answer) is to exclude non-latin characters.

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Gustav Essunger 2017-6-9

Thank you very much!!

Adam Danz 2021-6-2

Don't forget Mailojis! 😁

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Answer 2

oliver 2019-2-15

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编辑：oliver 2019-2-15

在 MATLAB Online 中打开

I think the above examples will miss quite a lot of emails, like all those containing a capital letter or things like: Peter.O'Toole@xyz.com. So my suggestion would be something like:

reg='[a-zA-Z0-9._%''+-]+@([a-zA-Z0-9._-])+\.([a-zA-Z]{2,4})';

Although with the wide variety of new TLDs nowadays, limiting the last character group to 2-4 letters may be obsolete (depending on your needs).