(tye)Re: How to look for patterns in a file and create a CR

{
    local $_= <DATA>;
    while(  defined $_  ) {
        chomp;
        s/(.)G57/$1\nG57/g;
        print $1   if  s/(.*\n)//s;
        if(  ! /G5?$/  ) {
            print $_,$/   if  "" ne $_;
            $_= <DATA>;
        } else {
            my $next= <DATA>;
            last    unless  defined $next;
            $_ .= $next;
        }
    }
    print $_,$/;
}
__END__
dasdfdafdsfadfdfaG57ewefdsfsdfsG
57dfadfasdfasdfsffdasG57dfsafdsf
sG57dfafdafdsfadfafdfasdfasdfasf
dafdfasdfasdfdsafasdfsdafasdfads
dfadfasfdsdfadfasdfasfdadsfasfdd
G57dsafdsfasdfadsfasdfadfadfadff
dfdf
[download]

This produces:

dasdfdafdsfadfdfa
G57ewefdsfsdfs
G57dfadfasdfasdfsffdas
G57dfsafdsf
s
G57dfafdafdsfadfafdfasdfasdfasf
dafdfasdfasdfdsafasdfsdafasdfads
dfadfasfdsdfadfasdfasfdadsfasfdd
G57dsafdsfasdfadsfasdfadfadfadff
dfdf
[download]

rather than what you asked for because it doesn't "join" lines unless it has to in order to match the string.

Update: This node briefly showed incorrect code because I forgot to paste the tested code back in.

- tye (but my friends call me "Tye")

Comment on (tye)Re: How to look for patterns in a file and create a CR Select or Download Code

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Re: (tye)Re: How to look for patterns in a file and create a CR by juo (Curate) on Mar 21, 2001 at 14:44 UTC
This didn't make it work completely. I have found the way to do it. First I remove all the returns and make one file of it. After that I build in again returns looking for a certain pattern. If somebody can make it <CR> shorter and knows how I can skip to make intermediate file and create straigt away the target file it is welcome. Pieter Here is the code : #!perl -w use strict; use FileHandle; my $file = "c:/perl/training/test/common.grb"; #source file my $file1 = "c:/perl/training/test/test5.txt"; #intermediate file, jus +t contain one long line my @users = readFile($file); for(@users) { chomp; s/\s+/ /g; } writeFile("c:/perl/training/test/test5.txt", @users); my @newUsers = readFile($file1); for (@newUsers) { s/(.)G57/$1\nG57/g; } writeFile("c:/perl/training/test/test6.txt", @newUsers);> #target fil +e, each line start with G57 sub readFile { my ($fileName) = @_; sysopen(F, $fileName, O_RDONLY) or die "\nCannot open #<CR> $file: $!\ +n"; my @fileContents = <F>; close(F); return @fileContents; } sub writeFile { my ($file, @contents) = @_; if(-e $file) { unlink $file or die "\nunable to remove $file: $!\n"; } sysopen(F, $file, O_RDWR \| O_EXCL \| O_CREAT, 0666) or die "\nCannot cr +eate $file: $!\n"; print F @contents or die "\nCannot write to $file: $!\n"; close(F) or die "\nCannot close filehandle - $file: $!\n"; } [download] Edit 2001-03-21 by mirod: added code tags	[reply] [d/l]

Replies are listed 'Best First'.

Re: (tye)Re: How to look for patterns in a file and create a CR
by juo (Curate) on Mar 21, 2001 at 14:44 UTC

This didn't make it work completely. I have found the way to do it. First I remove all the returns and make one file of it. After that I build in again returns looking for a certain pattern. If somebody can make it <CR> shorter and knows how I can skip to make intermediate file and create straigt away the target file it is welcome. Pieter Here is the code :

#!perl -w 

use strict;
use FileHandle;

my $file = "c:/perl/training/test/common.grb";
#source file 
my $file1 = "c:/perl/training/test/test5.txt"; #intermediate file, jus
+t contain one long line 
my @users = readFile($file);


for(@users) 
{
chomp;
s/\s+/ /g;
}

writeFile("c:/perl/training/test/test5.txt", @users);
my @newUsers = readFile($file1);

for (@newUsers) 
{
s/(.)G57/$1\nG57/g; 
} 

writeFile("c:/perl/training/test/test6.txt", @newUsers);>  #target fil
+e, each line start with G57 


sub readFile 
{ 
my ($fileName) = @_; 
sysopen(F, $fileName, O_RDONLY) or die "\nCannot open #<CR> $file: $!\
+n"; 
my @fileContents = <F>; 
close(F);
return @fileContents;
}

sub writeFile
{
my ($file, @contents) = @_;

if(-e $file)
{ 
unlink $file or die "\nunable to remove $file: $!\n";
} 

sysopen(F, $file, O_RDWR | O_EXCL | O_CREAT, 0666) or die "\nCannot cr
+eate $file: $!\n"; 
print F @contents or die "\nCannot write to $file: $!\n"; 
close(F) or die "\nCannot close filehandle - $file: $!\n"; 
}
[download]

Edit 2001-03-21 by mirod: added code tags

[reply]
[d/l]