Extract email and name with regex

Question

What would be the regular expressions to extract the name and email from strings like these?

johndoe@example.com
John 
John Doe &l         


        

Answer 1

The following regex appears to work on all inputs and uses only two capturing groups:

(?:"?([^"]*)"?\s)?(?:<?(.+@[^>]+)>?)

http://regex101.com/r/dR8hL3

Thanks to @RohitJain and @burning_LEGION for introducing the idea of non-capturing groups and character exclusion respectively.

Answer 2

use this regex "?([^"]*)"?\s*([^\s]+@.+)

group 1 contains name

group 2 contains email

Answer 3

This way you can get with or without name, removing the quotes.

\"*?(([\p{L}0-9-_ ]+)\"?)*?\b\ *<?([a-z0-9-_\.]+@[a-z0-9-_\.]+\.[a-z]+)>?

Answer 4

You can try this (same code as yours but improved), but you need to check returned groups after matching because the email is either returned in group 2 or group 3, depending on whether a name is given.

(?:("?(?:.*)"?)\s)?<(.*@.*)>|(.*@.*)

Answer 5

(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))

https://regex101.com/r/pVV5TI/1