Regular expression for 5 comma separated email id

Question

I trying to validate 5 comma separated email id in one regular expression. I currntly using below regex

^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4},?)+$

This is valid for one email id.

I would like to know how I can achieve the same, any small inputs on the same is also greatly appreciated.

Thanks in advance.

Possible duplicate of [How to match a comma separated list of emails with regex?](https://stackoverflow.com/questions/4412725/how-to-match-a-comma-separated-list-of-emails-with-regex) — Sajal, May 25 '17 at 08:26
are you sure your regex is for email? it seems a phone number. — Sierrodc, May 25 '17 at 08:27
[email protected],[email protected] like that i can add only 5 email Id is valid. [email protected],[email protected] like thai i add 6 or more email Id is invalid. — daredevil, May 25 '17 at 08:29
You shouldn't approach validating all the email addresses at the same time, it's difficult to show to the user what's wrong. Split your data into an `Array` and then validate each email and the `Array.prototype.length` value. `'[email protected],[email protected],[email protected],[email protected]'.split(',').map(validator);` — Hitmands, May 25 '17 at 08:31
Try it like this - `^[\w+.%-]+@[\w-.]+\.[A-Za-z]{2,4}(?:[\w+.%-]+@[\w-.]+\.[A-Za-z]{2,4}){0,4}$`. Basically: `^(?:,){0,4}$`. Note that if you put an unescaped `-` in `[\w+-.%]` it will form a range. Either escape it, or better, put at the start/end of the character class (`[-\w+.%]`). — Wiktor Stribiżew, May 25 '17 at 08:39

Wiktor Stribiżew · Accepted Answer · 2017-05-25T10:25:41.380

1

First of all, fix the pattern: - in between two chars inside a character class forms a range. So, the email part of your regex should be [-\w+.%]+@[\w-.]+\.[A-Za-z]{2,4} (note the position of - in the first character class, in the second, it is OK to put it between a shorthand character class \w and the next char).

Next, to match 1 to 5 comma-separated emails, you need to match the first one, and then match 0 to 4 emails. And add anchors around the pattern to make sure the pattern matches the whole string:

^[-\w+.%]+@[\w-.]+\.[A-Za-z]{2,4}(?:,[-\w+.%]+@[\w-.]+\.[A-Za-z]{2,4}){0,4}$

Basically, ^<EMAIL>(?:,<EMAIL>){0,4}$:

^ - start of string
<EMAIL> - an email pattern of yours
(?: - start of a non-capturing group acting as a container for a sequence of patterns:
- , - a comma
- <EMAIL> - an email pattern of yours
){0,4} - zero to four occurrences of these sequences above
$ - end of string.

Another idea is to split with , and then validate:

var s = "[email protected],[email protected],[email protected],[email protected],[email protected]";
var re = /^[-\w+.%]+@[\w-.]+\.[A-Za-z]{2,4}$/;
var items = s.split(",");
if (items.length <= 5 && items.filter(function(x) { return re.test(x); }).length === items.length ) {
   console.log("VALID => ", items);
} else {
   console.log("INVALID!");
}

edited May 25 '17 at 10:25

answered May 25 '17 at 09:57

Wiktor Stribiżew

607,720
39
448
563

Its working but I want atmost 5 email enter.1 email id enter is also valid.but 6 email enter is not valid. – daredevil May 25 '17 at 10:13
So, my initial assumption was valid. I have reverted the answer to what I posted initially. – Wiktor Stribiżew May 25 '17 at 10:16
Its working fine but I want to enter atmost 5 email id.I enter 3 or 4 email id is also valid. but 6 email id enter is not valid. – daredevil May 25 '17 at 10:19
[I fixed the single regex part](https://regex101.com/r/SblsSs/1). And I have fixed the JS solution right now. – Wiktor Stribiżew May 25 '17 at 10:24
Can I do same in case of Mobile Number using regex? – daredevil May 25 '17 at 12:22
I do but only one mobile number accepted. Regex:- ^((\+91-?)|0)?[0-9]{10}$ – daredevil May 25 '17 at 12:40
Your phone regex is `(\+91-?|0)?[0-9]{10}`, so use `^(\+91-?|0)?[0-9]{10}(?:,(\+91-?|0)?[0-9]{10}){0,4}$` or use the `^(\+91-?|0)?[0-9]{10}$` in the JS code like above. – Wiktor Stribiżew May 25 '17 at 12:49

score -1 · Answer 2 · edited May 25 '17 at 10:17

-1

Below regex for javaScript you can use for multiple comma separated email id, hope this work for you

/^(\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]{2,4}\s*?,?\s*?)+$/

edited May 25 '17 at 10:17

answered May 25 '17 at 08:29

mayur panchal

265
1
16

This regex will also match [strings with trailing whitespaces and a comma](https://regex101.com/r/zGs4bl/1). It is also not optimized since `[.-]` is matching a dot or `-` linearly, while `(\.|-)` will cause backtracking. – Wiktor Stribiżew May 25 '17 at 10:49
And besides, it matches more than 5 comma separated emails. – Wiktor Stribiżew May 25 '17 at 10:58
yes i know i explain Below regex for javaScript you can use for multiple comma separated email id, hope this work for you – mayur panchal May 25 '17 at 10:58

Regular expression for 5 comma separated email id

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