Regex and Javascript pattern build

Question

I just really need help with building a regex of this pattern [email protected]

Starts with at least 3 char not @
then @ (only one)
at least 3 char that are not . or @
and than one .
than 3 char that are not . or @

This is what I played with but it doesnt work

/^([a-zA-Z0-9._-]{3,})\.@([a-zA-Z0-9.-]{3,*})\.[a-zA-Z]{3,*}$/

What characters are legal? Are you trying to match an email address? You might try searching first, as there are hundreds of questions like this. — crush
– crush, Commented Sep 13, 2013 at 19:53
and if that's for validating email addresses, I can 99% guarantee that none of the answers are correct — Alnitak
– Alnitak, Commented Sep 13, 2013 at 19:55
At least keep your bad regex consistent! You put {3,} which is correct, but then later you put {3,*} twice... — Niet the Dark Absol
– Niet the Dark Absol, Commented Sep 13, 2013 at 19:55
How does it not work? The regular expression you described is /[^@]{3,}@[^@.]{3,}\.[^@.]{3}/ — FrankieTheKneeMan
– FrankieTheKneeMan, Commented Sep 13, 2013 at 19:55
possible duplicate of Using a regular expression to validate an email address — Jonathan
– Jonathan, Commented Sep 13, 2013 at 19:55

Adam Wolski · Accepted Answer · 2013-09-13 20:12:48Z

2

^[^@]{3,}@[^@\.]{3,}\.[^@\.]{3}$

This is the regex you're looking for. But if you want to validate an e-mail address don't use this regex.

edited Sep 13, 2013 at 20:12

answered Sep 13, 2013 at 19:55

Adam Wolski

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6 Comments

Andrew Clark Over a year ago

This is the regex he described, but I think it is very unlikely it is the one he is looking for.

Adam Wolski Over a year ago

true ;-) Validating e-mail with this regex is not proper

plalx Over a year ago

@AdamWolski, You are missing the ^...$, otherwise we could have /[^@]{3,}@[^@\.]{3,}\.[^@\.]{3}/.test('@[email protected]'); //true

Adam Wolski Over a year ago

According to his description, this can be valid. Note, that he didn't say that it should validate an e-mail address.

Adam Wolski Over a year ago

But, according to his attempt (he used ^ and $) you're right ;)

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Cjmarkham · Accepted Answer · 2013-09-13 19:58:35Z

0

/^([^@]{3,})@([^.@]{3,})\.([^.@]{})$/

First block matches atleast 3 characters that are not @ Second is one @ Third is atleast 3 characters that are not . or @ Fourth is a . Fifth is 3 characters that are not . or @

answered Sep 13, 2013 at 19:58

Cjmarkham

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Comments

davide · Accepted Answer · 2013-09-13 20:01:30Z

0

Try with

 /\b[^@]{3,}@[^.@]{3,}\.[^.@]{3}\b/

it should work. The \b means a token boundary.

edited Sep 13, 2013 at 20:01

answered Sep 13, 2013 at 19:55

davide

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