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comp.lang.ruby

Extracting range of lines

tmarc

7/15/2008 11:06:00 AM

Hello,

are there a ruby equivalents to perl's /regex/ .. /regex/ and /
regex/ ... /regex/ idioms, examples described at
http://www.unix.com.ua/orelly/perl/cookbook/ch...

I've been googling around with no relevant results.

Thanks in advance,
Tom
2 Answers

smn

7/15/2008 11:43:00 AM

0

the link is not working (i would need to sign up to the forum
first...)

On Jul 15, 1:05 pm, tmarc <tmarcin...@gmail.com> wrote:
> Hello,
>
> are there a ruby equivalents to perl's /regex/ .. /regex/ and /
> regex/ ... /regex/ idioms, examples described athttp://www.unix.com.ua/orelly/perl/cookbook/ch...
>
> I've been googling around with no relevant results.
>
> Thanks in advance,
> Tom

Peña, Botp

7/15/2008 11:55:00 AM

0

From: tmarc [mailto:tmarciniak@gmail.com]=20
# are there a ruby equivalents to perl's /regex/ .. /regex/ and /
# regex/ ... /regex/ idioms, examples described at
# http://www.unix.com.ua/orelly/perl/cookbook/ch...
# I've been googling around with no relevant results.

try searching for ruby+range+flip+flop

iianm, *that* perl/sed style is being deprecated.

eg,

File.open("test.txt") do |f|
while line=3Df.gets
p line
end
end
"--first\n"
"1234\n"
"456\n"
"4321\n"
"654\n"
"--second\n"
"546\n"
"3456\n"
"5436\n"
"9879\n"
"--third\n"
"1111\n"
#=3D> nil

File.open("test.txt") do |f|
while line=3Df.gets
p line if line =3D~ /^--second/ .. /^--third/
end
end
"--second\n"
#=3D> nil

so you get weird results.

the new ruby syntax is like,

File.open("test.txt") do |f|
while line=3Df.gets
p line if line =3D~ /^--second/ .. line =3D~ /^--third/
end
end
"--second\n"
"546\n"
"3456\n"
"5436\n"
"9879\n"
"--third\n"
#=3D> nil

hth.
kind regards -botp