2

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

string.string
string@string.com

I have used a pattern but it only accepts this format: string@string.com

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.

Mariano
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Owais
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    What is your regex flavour? – Stephan Nov 19 '15 at 09:47
  • 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

3 Answers3

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 string@testdomain.com

/(^[ ]*[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
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0

You can go with this way simpler version:

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

Correction thanks to Mariano

Community
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Thomas Ayoub
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  • Thanks. But it doesn't work for **string.string@string.com**. By string, i meant that it can be anything like abc_def@test.com or abc.def@ert.com etc... – Owais Nov 19 '15 at 09:46
  • and abc+def@ghi.com 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 `jean.paul.sarte@gmail.com` be a valid address? (ie: multi dot before @) – Thomas Ayoub Nov 19 '15 at 12:00
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.

Stephan
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