Email regex

ruby-talk
1

Hi

    I have a regular expression
/^([^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

This exactly fits my need except for one.

     But I have to pass this also sijo.kg@yahoo.com But Cannot.
Please help me to add this also to the above

Some example which are valid for above
sijo@yahoo.com
sijo@yahoo.co.uk

Some example which are not valid for above
.sijo@yahoo.com
sijo..kg@yahoo.com
sijo@@yahoo.com

Thanks in advance
Sijo

···

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2

[^.@\s,]

This character class excludes "." "@" whitespace and "," from being in
the first part of the e-mail.

Remove the dot and sijo.kg@yahoo.com will be allowed.

[^@\s,]

/^([^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

However, sijo..kg@yahoo.com will also be allowed. It's up to you here
- do you want to make the regex perfect or will this be good enough.

I think what you want is a optional repeating sequence of characters
followed by exactly 1 "." followed by a final sequence of characters
before the @

Something like this

/^((?:[^@\s,]+.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

Maybe?

Though you probably need to read here:
http://www.regular-expressions.info/email.html
http://blog.krugle.com/?p=208

···

On Thu, Sep 24, 2009 at 10:48 AM, Sijo Kg <sijo@maxxion.com> wrote:

Hi

I have a regular expression
/^([^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

This exactly fits my need except for one.

But I have to pass this also   sijo\.kg@yahoo\.com      But Cannot\.

Please help me to add this also to the above

Some example which are valid for above
sijo@yahoo.com
sijo@yahoo.co.uk

Some example which are not valid for above
.sijo@yahoo.com
sijo..kg@yahoo.com
sijo@@yahoo.com

Thanks in advance
Sijo
--
Posted via http://www.ruby-forum.com/\.

--
Paul Smith
http://www.nomadicfun.co.uk

paul@pollyandpaul.co.uk

3

Sijo Kg:

    I have a regular expression
/^([^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

This exactly fits my need except for one.

If your needs are checking email addresses’
validity, you really want to use something like¹

/^([a-zA-Z0-9&_?\/`!|#*$^%=~{}+'-]+|"([\x00-\x0C\x0E-\x21\x23-\x5B\x5D
-\x7F]|\\[\x00-\x7F])*")(\.([a-zA-Z0-9&_?\/`!|#*$^%=~{}+'-]+|"([\x00-\
x0C\x0E-\x21\x23-\x5B\x5D-\x7F]|\\[\x00-\x7F])*"))*@([a-zA-Z0-9&_?\/`!

#*$^%=~{}+'-]+|\[([\x00-\x0C\x0E-\x5A\x5E-\x7F]|\\[\x00-\x7F])*\])(\.

([a-zA-Z0-9&_?\/`!|#*$^%=~{}+'-]+|\[([\x00-\x0C\x0E-\x5A\x5E-\x7F]|\\[
\x00-\x7F])*\]))*$/

…as
" spaces! @s! \"escaped quotes!\" "@yahoo.com
is a perfectly valid email address.

(Note that
" spaces! @s! \"escaped quotes!\" "@łódź.pl
is also a perfectly valid email address which the above doesn’t match.)

You might want to check
¹ http://blade.nagaokaut.ac.jp/cgi-bin/vframe.rb/ruby/ruby-talk/173923?173909-178505
for the discussion on this.

— Shot

···

--
anyone who finds the MS Office ribbon intuitive is not a member
of the human species as I understand it [William Morgan]

4

[^.@\s,]

This character class excludes "." "@" whitespace and "," from being in
the first part of the e-mail.

Remove the dot and sijo.kg@yahoo.com will be allowed.

[^@\s,]

/^([^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

However, sijo..kg@yahoo.com will also be allowed. It's up to you here
- do you want to make the regex perfect or will this be good enough.

I think what you want is a optional repeating sequence of characters
followed by exactly 1 "." followed by a final sequence of characters
before the @

Something like this

/^((?:[^@\s,]+.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

Hmm, i forgot to escape a dot in there...

/^((?:[^@\s,]+\.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

···

On Thu, Sep 24, 2009 at 11:02 AM, Paul Smith <paul@pollyandpaul.co.uk> wrote:

Maybe?

Though you probably need to read here:
How to Find or Validate an Email Address
http://blog.krugle.com/?p=208

On Thu, Sep 24, 2009 at 10:48 AM, Sijo Kg <sijo@maxxion.com> wrote:

Hi

I have a regular expression
/^([^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

This exactly fits my need except for one.

But I have to pass this also   sijo\.kg@yahoo\.com      But Cannot\.

Please help me to add this also to the above

Some example which are valid for above
sijo@yahoo.com
sijo@yahoo.co.uk

Some example which are not valid for above
.sijo@yahoo.com
sijo..kg@yahoo.com
sijo@@yahoo.com

Thanks in advance
Sijo
--
Posted via http://www.ruby-forum.com/\.

--
Paul Smith
http://www.nomadicfun.co.uk

paul@pollyandpaul.co.uk

--
Paul Smith
http://www.nomadicfun.co.uk

paul@pollyandpaul.co.uk

5

Hi Paul Smith

    Thanks for the reply But if I use
/^((?:[^@\s,]+.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

   It fails
.sijo.kg@yahoo.com
sijo..kg@yahoo.com and
sijo@kg@yahoo.com

Sijo

···

--
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6

Hi Paul Smith
  Thanks again

Hmm, i forgot to escape a dot in there...

/^((?:[^@\s,]+\.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

     When tried this I get 2 failures

.sijo.kg@yahoo.com and
sijo..kg@yahoo.com

Sijo

···

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7

Did you read the pages I linked to?

/^((?:[^.@\s,]+\.)*[^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

(I forgot to put the . back in the excluded character classes at the start)

···

On Thu, Sep 24, 2009 at 11:22 AM, Sijo Kg <sijo@maxxion.com> wrote:

Hi Paul Smith
Thanks again

Hmm, i forgot to escape a dot in there...

/^((?:[^@\s,]+\.)*[^@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

When tried this I get 2 failures

.sijo.kg@yahoo.com and
sijo..kg@yahoo.com

Sijo

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Posted via http://www.ruby-forum.com/\.

--
Paul Smith
http://www.nomadicfun.co.uk

paul@pollyandpaul.co.uk

8

Hi Paul Smith

Did you read the pages I linked to?

/^((?:[^.@\s,]+\.)*[^.@\s,]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

(I forgot to put the . back in the excluded character classes at the
start)

   Lots of thanks.Now it works perfectly.Since it was a sudden fix I did
not .But now I start reading that pages to get a very good understanding
of regex

Thanks once again
Sijo

···

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