Bug with end of string characters in regex?

[Justin Coyne]

/\A\n\Z/m.match("\n\n") => #<MatchData>

shouldn't this expression return nil?


These both return nil.
/\A\n\Z/m.match("a\n")
/\A\n\Z/m.match("\na")


My understanding is that \A and \Z always match at the beginning/end of
the string irrespective of newlines.

-Justin

 

[Aldric Giacomoni]

/\A\n\Z/m.match("\n\n") => #<MatchData>

shouldn't this expression return nil?


These both return nil.
/\A\n\Z/m.match("a\n")
/\A\n\Z/m.match("\na")


My understanding is that \A and \Z always match at the beginning/end of
the string irrespective of newlines.

-Justin

Check out rubular.com

You are asking for:

\A # beginning of string
\n # newline
\Z # end of string

And by the way ... "\n" and /\n/ may not be the same, depending on what
the regexp wants to do with the backslash! you could try escaping it.
What do you want to match?
maybe:
/A # beginning of string
* # any characters
\\n # newline
* # any characters
/Z # end of string

 

[Justin Coyne]

Looks like I've solved my own problem the \Z in ruby doesn't have the
same semantics as it does in other languages. There is a \z which is
what I wanted so as expected:

/\A\n\z/m.match("\n\n") => nil


-Justin

 

[Jesús Gabriel y Galán]

Looks like I've solved my own problem the \Z in ruby doesn't have the
same semantics as it does in other languages. =A0There is a \z which is
what I wanted so as expected:

/\A\n\z/m.match("\n\n") =3D> nil

\z end of a string
\Z end of a string, or before newline at the end

So, \Z allows an extra \n at the end of the string.

Jesus.

 

[Robert Klemme]

\z =A0 =A0 =A0 =A0 =A0 =A0end of a string
\Z =A0 =A0 =A0 =A0 =A0 =A0end of a string, or before newline at the end

So, \Z allows an extra \n at the end of the string.

For the reference here's the doc:
http://www.geocities.jp/kosako3/oniguruma/doc/RE.txt

Cheers

robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

 

[Jesús Gabriel y Galán]

For the reference here's the doc:
http://www.geocities.jp/kosako3/oniguruma/doc/RE.txt

Good to know thanks. I copied the quote from:

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

Thanks.

Jesus.