CODEWITHSUNDEEP
javascriptregexemail
Alex Ghiculescu
Alex Ghiculescu

Reputation: 7540

Email verification regex failing on hyphens

I'm attempting to verify email addresses using this regex: ^.*(?=.{8,})[\w.]+@[\w.]+[.][a-zA-Z0-9]+$

It's accepting emails like [email protected] but rejecting emails like [email protected] (I'm using the tool at http://tools.netshiftmedia.com/regexlibrary/ for testing).

Can anybody explain why?

Upvotes: 1

Views: 5461

Answers (5)

Qinjie
Qinjie

Reputation: 1928

Following regex works:

([A-Za-z0-9]+[-.-_])*[A-Za-z0-9]+@[-A-Za-z0-9-]+(\.[-A-Z|a-z]{2,})+

Upvotes: 0

steveyang
steveyang

Reputation: 9298

Here is the explaination:

In your regualr expression, the part matches a-bc@def.com and abc@de-f.com is [\w.]+[.][a-zA-Z0-9]+$

It means:

  • There should be one or more digits, word characters (letters, digits, and underscores), and whitespace (spaces, tabs, and line breaks) or '.'. See the reference of '\w'

  • It is followed by a '.',

  • Then it is followed one or more characters within the collection a-zA-Z0-9.

So the - in de-f.com doesn't matches the first [\w.]+ format in rule 1.

The modified solution

You could adjust this part to [\w.-]+[.][a-zA-Z0-9]+$. to make - validate in the @string.

Upvotes: 2

talha2k
talha2k

Reputation: 1

Use this Regex:

var email-regex = /^[^@]+@[^@]+\.[^@\.]{2,}$/;

It will accept [email protected] as well as emails like [email protected].

You may also refer to a similar question on SO:

Why won't this accept email addresses with a hyphen after the @?

Hope this helps.

Upvotes: 1

Sai Kalyan Kumar Akshinthala
Sai Kalyan Kumar Akshinthala

Reputation: 11844

Instead you can use a regex like this to allow any email address.

^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$

Upvotes: 0

Dave Newton
Dave Newton

Reputation: 160191

Because after the @ you're looking for letters, numbers, _, or ., then a period, then alphanumeric. You don't allow for a - anywhere after the @.

You'd need to add the - to one of the character classes (except for the single literal period one, which I would have written \.) to allow hyphens.

\w is letters, numbers, and underscores.

A . inside a character class, indicated by [], is just a period, not any character.

In your first expression, you don't limit to \w, you use .*, which is 0+ occurrences of any character (which may not actually be what you want).

Upvotes: 1

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