I'm trying to transform this kind of line :
123232321
FOOFOOFOO
..
2431232
BARBARBAR
to
<number>123232321</number> (actually XML)
<number>2431232</number>
So I have coded this script
File.open("D:/digisoft/1b.txt","r") do |f2|
while line = f2.gets
f3 = line.gsub!(/\d+$/,'<number>\1</number>')
puts f3
end
end
but Ruby doesn't seem to apraciate .. I search example and I found
that variable as $1, \1, &$ could do this job but i can't get it
works.
How can I get the match of my regexp and add <number> blocks please ?
You’re missing the brackets around the \d+, like so:
f3 = line.gsub(/(\d+)$/,'<number>\1</number>')
Note that I am also using String#gsub not String#gsub! as that will
change your line variable also.
···
On Mon Jul 28 21:44:41 2008, Romain LOMBARDO wrote:
Hi people,
I'm trying to transform this kind of line :
123232321
FOOFOOFOO
..
2431232
BARBARBAR
to
<number>123232321</number> (actually XML)
<number>2431232</number>
So I have coded this script
File.open("D:/digisoft/1b.txt","r") do |f2|
while line = f2.gets
f3 = line.gsub!(/\d+$/,'<number>\1</number>')
puts f3
end
end
but Ruby doesn't seem to apraciate .. I search example and I found
that variable as $1, \1, &$ could do this job but i can't get it
works.
How can I get the match of my regexp and add <number> blocks please ?
thanks you
--
Fred O. Phillips
BBC7 7572 755F 83E0 3209 504A E4F7 874F 1545 9D41
\1 means "first group", but there are no groups in your regex. \0 means "whole
match", so that's the one you want.
Another thing: gsub! is the mutating variant of gsub. It will return nil when
no change occurs or self when there is a change. Either way it does not make
sense to store its return value.
And yet another thing: there is no sense in using gsub (as opposed to sub)
with a regex that only matches once anyway.
while line = f2.gets
print '<number>',line.to_i,'</number>',"\n" if line=~/\d/
end
- I am not sure if this is perfect solution, but this works and prints
what you expected.
Thanks,
sathyz
···
On Jul 28, 5:42 pm, Romain LOMBARDO <touf...@gmail.com> wrote:
Hi people,
I'm trying to transform this kind of line :
123232321
FOOFOOFOO
..
2431232
BARBARBAR
to
<number>123232321</number> (actually XML)
<number>2431232</number>
So I have coded this script
File.open("D:/digisoft/1b.txt","r") do |f2|
while line = f2.gets
f3 = line.gsub!(/\d+$/,'<number>\1</number>')
puts f3
end
end
\1 means "first group", but there are no groups in your regex. \0 means "whole match", so that's the one you want.
I wasn't aware that \0 does the job as well. I always use \& for the whole match. Learn something new every day.
Another thing: gsub! is the mutating variant of gsub. It will return nil when no change occurs or self when there is a change. Either way it does not make sense to store its return value.
And yet another thing: there is no sense in using gsub (as opposed to sub) with a regex that only matches once anyway.
Absolutely.
Another remark, iterating through a file can be made easier:
File.foreach("D:/digisoft/1b.txt") do |line|
line.gsub!(/\d+$/,'<number>\\&</number>')
puts line
end
