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How to replace multiple lines in a text file?


By : Sindijs Eizengraudin
Date : July 31 2020, 01:00 PM
I hope this helps . I think you shouldn't read your file line by line for this problem. It is not that python does not replace line breaks, but as each line ends at line break, you can't have any line matching your multi-lines content.
You could instead read whole file with content=file.read() and perform the substitution on content.
code :


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Remove multiple lines from a text file after a specific string, then replace with new text


By : jcbaezk
Date : March 29 2020, 07:55 AM
hope this fix your issue This is notably not the fastest implementation for large files, but should work.
code :
for subdir, dirs, files in os.walk(rootdir):
    for file in files:
        output=[]
        with open(file, 'r') as inF:
            for line in inF:
                output.append(line)
                if 'criteria' in line: break
        f=open(file, 'a')
        Lorem_list=['Lorem Ipsum','Lorem Ipsum','Lorem Ipsum']
        #The '\n' may look strange, but I am using your previous syntax.
        #This also will result in a blank line. I would suggest revising the
        #way you place text to follow the (x+'\n') format.
        [f.write(x) for x in output]
        [f.write('\n      '+x) for x in Lorem_list]
        f.close()
Lorem_list=['Lorem Ipsum','Lorem Ipsum','Lorem Ipsum']
[f.write('\n      '+x) for x in Lorem_list]
    f.write("\n      Lorem Ipsum")
    f.write("\n      Lorem Ipsum")
    f.write("\n      Lorem Ipsum")

How to find and replace multiple lines in text file?


By : AwesomeZander
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further If the file is large, you want to read and write one line at a time, so the whole thing isn't loaded into memory at once.
code :
# create a dict of find keys and replace values
findlines = open('find.txt').read().split('\n')
replacelines = open('replace.txt').read().split('\n')
find_replace = dict(zip(findlines, replacelines))

with open('data.txt') as data:
    with open('new_data.txt', 'w') as new_data:
        for line in data:
            for key in find_replace:
                if key in line:
                    line = line.replace(key, find_replace[key])
            new_data.write(line)

Replace multiple lines in text file


By : MAHAK STUDIO
Date : March 29 2020, 07:55 AM
it should still fix some issue Copy the file over to a new one, except that within the range of text between these markers drop the replacement text instead. Then move that file to replace the original, as it may be needed judging by the attempted perl -0 -i in the question.
Note that when changing a file we have to build new content and then replace the file. There are a few ways to do this and modules that make it easier, shown further below.
code :
use warnings;
use strict;
use feature 'say';
use File::Copy 'move';

my $replacement = "replacement text";

my $file     = 'input.txt';
my $out_file = 'new_' . $file;

open my $fh_out, '>', $out_file or die "Can't open $out_file: $!";
open my $fh,     '<', $file     or die "Can't open $file: $!";

while (<$fh>) 
{
    if (my $range_cnt = /^\s*DIFF_COEFF\s*=/ .. /^\s*DIFF_COEFF_Q\s*=/) #/
    {
        if ($range_cnt =~ /E0$/)
        {
            print $fh_out $replacement;  # may need a newline
            print $fh_out $_;         
        }
    }   
    else { 
        print $fh_out $_; 
    }
}
close $fh     or die "Can't close $file: $!";      # don't overwrite original
close $fh_out or die "Can't close $out_file: $!";  # if there are problems

#move $out_file, $file or die "Can't move $file to $out_file: $!";
my $text = do {  # slurp file into a scalar
    local $/; 
    open my $fh, '<', $file or die "Can't open $file: $!"; 
    <$fh> 
};

$text =~ s/^\s*DIFF_COEFF\s*=.*?(\n\s*DIFF_COEFF_Q)/$replacement$1/ms;

# Change $out_file to $file to overwrite
open my $fh_out, '>', $out_file or die "Can't open $out_file: $!";
print $fh_out $text;
use Path::Tiny;
                      # NOTE: edits $file in place (changes it)
path($file)->edit( 
    sub { s/DIFF_COEFF=.*?(\n\s*DIFF_COEFF_Q)/$replacement$1/s } 
);

Replace file text between two words across multiple lines


By : user1999649
Date : March 29 2020, 07:55 AM
wish helps you As mentioned in the comments, you'll need to enable the s modifier to have the .+?part also match line breaks.
As Ansgar mentions the m isn't neccessary here, but could enhance the start by anchoring at line begin with (?<=^xstart)
code :
$file='C:\Path\to\file.txt'
$raw = Get-Content $file -Raw
$raw = $raw -ireplace '(?s)(?<=start).+?(?=end)', 'YYY'
$raw | Set-Content $file
$file='C:\Path\to\file.txt'
$raw = (Get-Content $file -Raw) -ireplace '(?s)(?<=start).+?(?=end)', 'YYY'
$raw | Set-Content $file

How to replace multiple lines from a text file using Powershell -replace


By : user2780292
Date : March 29 2020, 07:55 AM
To fix this issue I am writing a script changing the memory value within a configuration file. I want to search for a set specific set of lines within this file, and I tried using PowerShell to do the job. , If you want to use -Replace the following will work:
code :
$NewContent = (Get-Content "C:\Program Files\NetBrain\Worker Server\conf\rmworker.json" -Raw) -replace "(?ms)""execName"": ""BuildDynamicMap"",.*?""execCategory"": 1,.*?""maximumMemory"": 4294967296" , """execName"": ""BuildDynamicMap"",`r`n`t""execCategory"": 1,`r`n`t""maximumMemory"": 8589934592"
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