Ok ... I really tried. And I used http://rubular.com/ (really nice)
And I read and reread the pickaxe book section on regular
expressions.
In other words ... I tried.
So ..
How does one create an expression that fails if there are two or more periods
(e.g. "..") in a row?
=> false
One easy way is to use the negated match operator (!~). Then the
regexp is trivial.
Jesus.
On Thu, Nov 26, 2009 at 8:51 PM, Ralph Shnelvar <ralphs@dos32.com> wrote:
Ok ... I really tried. And I used http://rubular.com/ (really nice)
And I read and reread the pickaxe book section on regular
expressions.In other words ... I tried.
So ..
How does one create an expression that fails if there are two or more periods
(e.g. "..") in a row?
"abc..def" !~ /\.\./
if ! /\.{2,}/
or something
2009/11/26 Ralph Shnelvar <ralphs@dos32.com>
Ok ... I really tried. And I used http://rubular.com/ (really nice)
And I read and reread the pickaxe book section on regular
expressions.In other words ... I tried.
So ..
How does one create an expression that fails if there are two or more
periods
(e.g. "..") in a row?
Ralph Shnelvar wrote:
How does one create an expression that fails if there are two or more
periods
(e.g. "..") in a row?
As previously mentioned, you can use this:
/\.{2,}/
You can also use this:
/[..+]/
Though of course, you -want- to get 'nil' instead of a match.
On the other hand, if you are looking to validate an email address,
there are already rails plugins that do that (and more) - so why
reinvent the wheel? 
--
Posted via http://www.ruby-forum.com/\.
"abc..def" !~ /\.\./
=>> false
I don't think that
"abc..def" !~ /\.\./
is a regular expression.
/\.\./
is a regular expression.
Basically ... I need something that will work in a Rails validates_format_of
# Reject if the email address has two periods in a row
validates_format_of :email,
# See Email address - Wikipedia
:with => ???,
:message => 'invalid email format'
Ralph Shnelvar wrote:
How does one create an expression that fails if there are two or more
periods
(e.g. "..") in a row?As previously mentioned, you can use this:
/\.{2,}/
That only positively matches strings which contain at least two dots
in a row. OP specifically wanted to _not_ have a match for two dots
in a row.
You can also use this:
/[..+]/
Did you test that? How should this expression match two dots in a
row? You have define a character class with "." and "+" where one dot
is redundant.
irb(main):001:0> /[..+]/ =~ "+"
=> 0
irb(main):002:0> /[..+]/ =~ "."
=> 0
On the other hand, if you are looking to validate an email address,
there are already rails plugins that do that (and more) - so why
reinvent the wheel?
If he's reinventing the wheel then that's certainly not a good idea.
I just guess that you are talking about a different wheel.
Kind regards
robert
2009/11/27 Aldric Giacomoni <aldric@trevoke.net>:
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
so then only trying to match:
/\w+\.?\w*/
should do
2009/11/26 Ralph Shnelvar <ralphs@dos32.com>
>>> "abc..def" !~ /\.\./
=>> falseI don't think that
"abc..def" !~ /\.\./
is a regular expression./\.\./
is a regular expression.Basically ... I need something that will work in a Rails
validates_format_of# Reject if the email address has two periods in a row
validates_format_of :email,
# See Email address - Wikipedia
:with => ???,
:message => 'invalid email format'
You could try negative lookahead
irb(main):001:0> s=["aaa", "a.", ".a", "a..", "..a"]
=> ["aaa", "a.", ".a", "a..", "..a"]
irb(main):002:0> s.map {|x| [x, /\A(?:.(?!\.\.))*\z/ =~ x]}
=> [["aaa", 0], ["a.", 0], [".a", 0], ["a..", nil], ["..a", 0]]
Or maybe there is an ":without" which uses the negated match?
Kind regards
robert
On 11/26/2009 09:46 PM, Ralph Shnelvar wrote:
"abc..def" !~ /\.\./
=>> false
I don't think that
"abc..def" !~ /\.\./
is a regular expression./\.\./
is a regular expression.Basically ... I need something that will work in a Rails validates_format_of
# Reject if the email address has two periods in a row
validates_format_of :email,
# See Email address - Wikipedia
:with => ???,
:message => 'invalid email format'
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
Robert Klemme wrote:
You can also use this:
/[..+]/Did you test that? How should this expression match two dots in a
row? You have define a character class with "." and "+" where one dot
is redundant.irb(main):001:0> /[..+]/ =~ "+"
=> 0
irb(main):002:0> /[..+]/ =~ "."
=> 0
I did test it. Just not well. 
--
Posted via http://www.ruby-forum.com/\.
Ralph Shnelvar wrote:
Basically ... I need something that will work in a Rails
validates_format_of# Reject if the email address has two periods in a row
validates_format_of :email,
# See
Email address - Wikipedia
:with => ???,
:message => 'invalid email format'
Regex = Regexp.new('^((' + LocalPartUnquoted + ')|(' + LocalPartQuoted +
')+)@(((\w+\-+[^_])|(\w+\.[^_]))*([a-z0-9-]{1,63})\.[a-z]{2,6}$)',
Regexp::EXTENDED | Regexp::IGNORECASE)
--
Posted via http://www.ruby-forum.com/\.