Can you get the 1st occurrence of a value using grep?

ruby-talk
1

Can you get a 1st occurence of a sting inside a huge text file?

For instance, I know that there will be 1 or more occurrences of a the
string 'fail' in a text file and I only want to get the first line
containing the 'fail' instead of getting every line with a fail. My
program reads over 100 files that may contain one or more 'fail' values.

Thanks
MC

Dir["//MYFile/*.txt"].each do |textfile|
    getGrepOffense = textfile.grep(/fail/)
    strOffense = getGrepOffense.join
    puts strOffense
end

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2

lines.detect {|l| l =~ /fail/}

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On Thu, May 14, 2009 at 2:30 PM, Mmcolli00 Mom <mmc_collins@yahoo.com> wrote:

Can you get a 1st occurence of a sting inside a huge text file?

For instance, I know that there will be 1 or more occurrences of a the
string 'fail' in a text file and I only want to get the first line
containing the 'fail' instead of getting every line with a fail. My
program reads over 100 files that may contain one or more 'fail' values.

Thanks
MC

Dir["//MYFile/*.txt"].each do |textfile|
getGrepOffense = textfile.grep(/fail/)
strOffense = getGrepOffense.join
puts strOffense
end
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Posted via http://www.ruby-forum.com/\.

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thanks,
-pate
-------------------------
Don't judge those who choose to sin differently than you do

3

Mmcolli00 Mom wrote:

Can you get a 1st occurence of a sting inside a huge text file?

For instance, I know that there will be 1 or more occurrences of a the
string 'fail' in a text file and I only want to get the first line
containing the 'fail' instead of getting every line with a fail. My
program reads over 100 files that may contain one or more 'fail' values.

Thanks
MC

Dir["//MYFile/*.txt"].each do |textfile|
    getGrepOffense = textfile.grep(/fail/)
    strOffense = getGrepOffense.join
    puts strOffense
end

[~/tmp] cat grepfail.rb
DATA.grep /fail/ do |line|
   p line
   break
end

__END__
ok 1
ok 2
fail 1
ok 3
fail 2
fail 3
[~/tmp] ruby grepfail.rb
"fail 1\n"

This should work with an open File in place of DATA.

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       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

4

Cool thanks! -MC

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