Re^2: looking for speed!! large file search and extract

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Re^3: looking for speed!! large file search and extract by smbs (Acolyte) on Jan 12, 2005 at 17:00 UTC
Thanx for answer but now have to make a small change I only want to extract the lines on condition that the line directly above it starts and ends with the following 5 chararacters "xyzdf" basically looking for 2 line match thanx	[reply]
Re^4: looking for speed!! large file search and extract by Tanktalus (Canon) on Jan 12, 2005 at 17:07 UTC
A couple minor points (and maybe I'm a bit too new to PM to make the comments): You probably should have this in a new question, not a reply on the previous question, since it's now a new question. You probably should try something yourself, and then come back if it doesn't work. Or even if it does - share your answer and get feedback on it. One WTDI is to use a simplified state machine: `my $match; while (<FH>) { print C $_ if $match and /^abcde.*PARTNAME$/; $match = /xyzdf$/; }` [download] This will set $match to true if the current line matches xyzdf at the end, false otherwise. The next time through the loop, we only check your second-line regexp if $match is already true (that is, the previous line matched the other regexp).	[reply] [d/l]
Re^5: looking for speed!! large file search and extract by Roy Johnson (Monsignor) on Jan 12, 2005 at 17:18 UTC
It's not uncommon for people to modify their requirements. I think it belongs in the same thread as long as it's pretty close to the original problem. Caution: Contents may have been coded under pressure.	[reply]
Re^4: looking for speed!! large file search and extract by kutsu (Priest) on Jan 12, 2005 at 17:08 UTC
then change holli's command line statement from `perl -n -e "print if /^abcde/ && /PARTNAME$/" c:\somefile.txt>k:\1\somefile.txt` to `perl -n -e "print if /^xyzdf/ && /xyzdf$/" c:\somefile.txt>k:\1\somefile.txt` If you don't understand this I really recommend you read perlre Update: Somehow missed reading "line directly above", so ignore the rest...except for reading perlre that's always a good idea if you haven't "Cogito cogito ergo cogito sum - I think that I think, therefore I think that I am." Ambrose Bierce	[reply] [d/l] [select]
Re^4: looking for speed!! large file search and extract by holli (Abbot) on Jan 12, 2005 at 19:19 UTC
if i get your comment right, this could be: `c:\> perl -n -e "print $last, $_ if /xyzdf$/ && $last; $last= /^xyzdf +/ ? $_ : ''" file1>file2` [download] Assuming file1 looks like `abc xyzdf def hij xyzdf klm xyzdf nop qrs xyzdf` [download] file2 will end up as `xyzdf def hij xyzdf xyzdf nop qrs xyzdf` [download] Is that what you want? Update: if not, post some sample data and the desired output.	[reply] [d/l] [select]
Re^5: looking for speed!! large file search and extract by smbs (Acolyte) on Jan 13, 2005 at 09:39 UTC
Thanx but not what I would like Input file xyzdfhhlhlljjlxyzdf PARTNAMEhjjhhjhjkjkjkjkjPARTNAME hjill'''; hgkjlklj xyzdfhhlhll666666jlxyzdf PARTNAMEhjjh88888888888jkjkjkjkjPARTNAME xyzdfh PARTNAMEh_not_to_be_extracted_jkjkjkjPARTNAME ghghjhj jlkjpkj xyzdfhhlh888888888ljjlxyzdf PARTNAMEhjjh8888iiiiiiiiiiiii888jkjkjkjkjPARTNAME Output file PARTNAMEhjjhhjhjkjkjkjkjPARTNAME PARTNAMEhjjh88888888888jkjkjkjkjPARTNAME PARTNAMEhjjh8888iiiiiiiiiiiii888jkjkjkjkjPARTNAME only 3 lines extracted because line above condition not meet	[reply]
Re^6: looking for speed!! large file search and extract by holli (Abbot) on Jan 13, 2005 at 10:14 UTC