Grep a block

ruby-talk
1

Hi,

Please can anybody tell how to grep a block?
between 2 string i had few lines of code

example:
<mms:MmsCcppAccept>
1
2
3
4
5
</mms:MmsCcppAccept>

i've tried that way but its not working, see below my code:

···

---
#!/usr/bin/ruby

filename = ARGV[0]

File.open(filename).each do |line|
if line =~ /<mms:MmsCcppAccept>/../<\/mms:MmsCcppAccept>/
        puts line
        end
end
----

Please help me

Regards
Beny18241
--
Posted via http://www.ruby-forum.com/.

2

try:

#!/usr/bin/ruby

filename = ARGV[0]

File.open(filename).each do |line|
   if line =~ /<mms:MmsCcppAccept>/..line =~ /<\/mms:MmsCcppAccept>/
      puts line
   end
end

Is this what you're looking for?

3

ok closed Ifigue it out :slight_smile:

puts ARGF.read.scan(/<mms:MmsCcppAccept>.*?<\/mms:MmsCcppAccept>/m)

beny18241

beny 18241 wrote:

···

Hi,

Please can anybody tell how to grep a block?
between 2 string i had few lines of code

example:
<mms:MmsCcppAccept>
1
2
3
4
5
</mms:MmsCcppAccept>

i've tried that way but its not working, see below my code:

---
#!/usr/bin/ruby

filename = ARGV[0]

File.open(filename).each do |line|
if line =~ /<mms:MmsCcppAccept>/../<\/mms:MmsCcppAccept>/
        puts line
        end
end
----

Please help me

Regards
Beny18241

--
Posted via http://www.ruby-forum.com/\.

4

beny 18241 wrote:

Hi,

Please can anybody tell how to grep a block?
between 2 string i had few lines of code

example:
<mms:MmsCcppAccept>
1
2
3
4
5
</mms:MmsCcppAccept>

i've tried that way but its not working, see below my code:

---
#!/usr/bin/ruby

filename = ARGV[0]

File.open(filename).each do |line|
if line =~ /<mms:MmsCcppAccept>/../<\/mms:MmsCcppAccept>/
        puts line
        end
end
----

The tiny language Awk is good for things like this.

awk "/<mms:MmsCcppAccept>/,/<\/mms:MmsCcppAccept>/" file

···

--

5

Eric's solution is better for large files because it requires reading
the file line by line only. Note that it uses a special feature of
"if" when using a range with boolean expressions: in that case
matching state is stored and the complete expression is true when the
first matches, stays true and only switches back to false if the
second matches:

irb(main):001:0> 10.times {|i| if /^3/ =~ i.to_s .. /^7/ =~ i.to_s; puts i; end}
3
4
5
6
7
=> 10

irb(main):002:0> 10.times {|i| if i == 3 .. i == 7; puts i; end}
3
4
5
6
7
=> 10

Note: the second example is merely for demonstration purposes, it can
also be done with a single integer range match:

irb(main):003:0> 10.times {|i| if (3..7) === i; puts i; end}
3
4
5
6
7
=> 10

Kind regards

robert

···

2009/12/18 beny 18241 <beny18241@gmail.com>:

ok closed Ifigue it out :slight_smile:

puts ARGF.read.scan(/<mms:MmsCcppAccept>.*?<\/mms:MmsCcppAccept>/m)

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

6

Hi,

···

Am Freitag, 18. Dez 2009, 23:39:40 +0900 schrieb Robert Klemme:

2009/12/18 beny 18241 <beny18241@gmail.com>:
> ok closed Ifigue it out :slight_smile:
>
> puts ARGF.read.scan(/<mms:MmsCcppAccept>.*?<\/mms:MmsCcppAccept>/m)

Eric's solution is better for large files because it requires reading
the file line by line only. Note that it uses a special feature of
"if" when using a range with boolean expressions: in that case
matching state is stored and the complete expression is true when the
first matches, stays true and only switches back to false if the
second matches:

  10.times {|i| if /^3/ =~ i.to_s .. /^7/ =~ i.to_s; puts i; end}

The name of the feature is flip-flop if you like to google for it.

I'm not sure whether it really makes code more readable.

Bertram

--
Bertram Scharpf
Stuttgart, Deutschland/Germany
*
Discover String#notempty? at <http://raa.ruby-lang.org/project/step&gt;\.