Regex to accept matches only two formats: string.string and [email protected]

Question

I need a regular expression to accept only two below formats:

string.string
[email protected]

I have used a pattern but it only accepts this format: [email protected]

How to update this pattern

/^[ ]*[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-Z0-9-]*[a-zA-Z0-9])?[ ]*$/g

to accept both of the formats.

If you're validating e-mails, you might be interested in http://www.regular-expressions.info/email.html and [Using a regular expression to validate an email address](http://stackoverflow.com/q/201323/5290909) — Mariano, Nov 19 '15 at 10:05
Thanks. This is very much described. i will look into it. however, i have created a regular expression so far so good for the requirement as i am running out of time. `(^[ ]*[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-Z0-9-]*[a-zA-Z0-9])?[ ]*$)|([a-zA-Z0-9]+\.[a-zA-Z0-9]+)` — Owais, Nov 19 '15 at 10:07
It looks like you're reinventing the wheel, with an expresssion that would probably fail (of course, that depends on your scope). — Mariano, Nov 19 '15 at 10:19

Owais · Accepted Answer · 2015-11-19T10:16:14.993

1

Actually, I have updated the pattern which accepts both the formats, now.

Below is the pattern to accept both the format. i.e. abc.def and [email protected]

/(^[ ]*[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-Z0-9-]*[a-zA-Z0-9])?[ ]*$)|([a-zA-Z0-9]+\.[a-zA-Z0-9]+)/

edited Nov 19 '15 at 10:16

answered Nov 19 '15 at 09:49

Owais

49
12

score 0 · Answer 2 · edited May 23 '17 at 10:29

0

You can go with this way simpler version:

^\w+[.]\w+$|^\w+@\w+[.]com$

Correction thanks to Mariano

edited May 23 '17 at 10:29

Community

1
1

answered Nov 19 '15 at 09:42

Thomas Ayoub

29,063
15
95
142

Thanks. But it doesn't work for **[email protected]**. By string, i meant that it can be anything like [email protected] or [email protected] etc... – Owais Nov 19 '15 at 09:46
and [email protected] is valid? – Thomas Ayoub Nov 19 '15 at 09:47
No, i want only two formats. **anything without characters (dot) anything without characters** AND **anything without characters (@) anything without characters (dot) com** – Owais Nov 19 '15 at 09:52
@user2632691 you want to validate email, don't you? – Thomas Ayoub Nov 19 '15 at 10:01
i want to use email but at the same time, if a user does not have an email, then he can use this EMAIL field in DB as a username but his username should be his firstname.lastname , then. – Owais Nov 19 '15 at 10:03
@user2632691 then here's the [full regex email validation](http://ex-parrot.com/~pdw/Mail-RFC822-Address.html) and I recommend you to read [Stop Validating Email Addresses With Regex](http://davidcel.is/posts/stop-validating-email-addresses-with-regex/) because it's anything but simple :) – Thomas Ayoub Nov 19 '15 at 10:05
hahaha. Okay. But client requirement is as such i described in above comment. Thanks – Owais Nov 19 '15 at 10:11
Ya exactly in many cases But this case can be achieved, i think. – Owais Nov 19 '15 at 10:31
@Owais then would `[email protected]` be a valid address? (ie: multi dot before @) – Thomas Ayoub Nov 19 '15 at 12:00

Stephan · Answer 3 · 2015-11-19T09:50:57.743

0

Try this:

^\s*\w+(?:\.\w+|@\w+\.com)\s*$

Description

Regular expression visualization

You can replace \w+ with a character class ([\w.|]+ for example) to add other accepted characters.

edited Nov 19 '15 at 09:50

answered Nov 19 '15 at 09:44

Stephan

41,764
65
238
329

How do you generate this description ? looks really nice – Valentin Clement Nov 19 '15 at 11:13

Regex to accept matches only two formats: string.string and [email protected]

3 Answers3

Description