正则表达式检测连字符

Question

Live demo: http://regex101.com/r/wW6wC4

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I'm trying to add a regex expression that allows email addresses like:

asdf.asdf@test-dom-a.com

([\w+\.]+@[\w]{1,})(\.)([0-9a-zA-Z\.\-]{1,})
                                     ^---- Thought this would allow hyphens...

what am I missing here?

Answer 1

Your pattern requires that the hyphen appears after a period. Try this instead:

([\w+.]+@[\w-]{1,})(\.)([0-9a-zA-Z.-]+)

Demonstration

Or more simply:

([\w+.]+@[\w.-]+)

Although the second pattern doesn't require that the second part of the address contains a period.

Demonstration

Answer 2

Your regex:

([\w+\.]+@[\w]{1,})(\.)([0-9a-zA-Z\.\-]{1,})

This will allow hyphen as last character only.

To allow it anywhere use:

^([\w+.-]+@[\w-])(\.)([0-9a-zA-Z.-])$

OR to allow it only in between use (except first and last position):

^[\w+.-]*@\w[\w-]*\.[\w-]*[0-9a-zA-Z.]+$

Working Demo: http://regex101.com/r/lQ1nV7

Answer 3

Your hyphen code appears in the segment that checks characters after the first period in the domain name. You need to add it to the match block before the domain name:

([\w+\.]+@[\w\-]{1,})(\.)([0-9a-zA-Z\.\-]{1,})
             ^^----  check here as well.

In reality, I would search for a more comprehensive email regex - the one you have doesn't seem robust enough IMHO.

Answer 4

You're not matching strings of the form "asd@fge.hj-kl", which as you can see not what you want.

([\w+\.]+)@([0-9a-zA-Z\.\-]{1,})\.com
([\w+\.]+)@([0-9a-zA-Z\.\-]{1,})\.([\w]{1,})