Regular expressions in Ruby

[Abder-rahman Ali]

I'm new to Ruby, and just want to ask about how to read the following
statement from the "Agile Web Development With Rails, 3rd edition" book:

%r{\.(gif|jpg|png)$}i

I knew that %r is a way to write a regular expression.

But, what is the $, and the i?

Thanks.

 

[saurabh purnaye]

[Note: parts of this message were removed to make it a legal post.]

I suppose this shall help
http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm

--
Thanks and Regards
Saurabh Purnaye
+91-9922071155
skype: sorab_pune
yahoo & gtalk: saurabh.purnaye
msn: (e-mail address removed)

 

[Luis Parravicini]

I'm new to Ruby, and just want to ask about how to read the following
statement from the "Agile Web Development With Rails, 3rd edition" book:

%r{\.(gif|jpg|png)$}i

I knew that %r is a way to write a regular expression.

But, what is the $, and the i?

$ matches the end of the string and i makes the search case
insensitve. This is not Ruby specific, perphaps you should read about
regular expressions. See http://www.regular-expressions.info/ruby.html

Bye

 

[Marc Weber]

But, what is the $, and the i?
-> http://rubular.com/ -> Regex quick reference

The \ escapes the . Thus \. matches the '.' character.

Marc Weber

 

[Jesús Gabriel y Galán]

I'm new to Ruby, and just want to ask about how to read the following
statement from the "Agile Web Development With Rails, 3rd edition" book:

%r{\.(gif|jpg|png)$}i

I knew that %r is a way to write a regular expression.

But, what is the $, and the i?

I always have this link handy:

http://www.zenspider.com/Languages/Ruby/QuickRef.html#11

$ matches the end of a line or string
i is a modifier that makes the regexp case insensitive.

Jesus.

 

[Brian Candler]

%r{\.(gif|jpg|png)$}i

I knew that %r is a way to write a regular expression.

But, what is the $, and the i?

http://www.ruby-doc.org/docs/ProgrammingRuby/html/language.html#UK

 

[Abder-rahman Ali]

http://www.ruby-doc.org/docs/ProgrammingRuby/html/language.html#UK

Thanks Brian.

 

[Josh Cheek]

[Note: parts of this message were removed to make it a legal post.]

On Mon, Jun 14, 2010 at 10:24 AM, Abder-rahman Ali <

I'm new to Ruby, and just want to ask about how to read the following
statement from the "Agile Web Development With Rails, 3rd edition" book:

%r{\.(gif|jpg|png)$}i

It matches a dot, followed by either gif or jpg or png, at the end of the
string. It does not care about case.

For example, it would match

foo.gif
foo.GiF
fOoO.jpg
bar.PNG


It would not match

foogif
foo.gif.
foo.giff
foo.jp
foo.pjg
foo.jpx
foo.jpg.csv