Search and replace a string using Windows shell or Perl script

Question

How can i search for //packages/thirdparty/release/main.txt #10 and replace #10 with #15 (set VARIABLE="#15") using batch commands and also ignoring spaces. #10 can be anything, lets assume #XXX.

testlog.txt

   //packages/thirdparty/release/config.txt                    #8
   //packages/thirdparty/release/config2.txt   #3
   //packages/thirdparty/release/config1.txt    #4
   //packages/thirdparty/release/main.txt            #10

This is my try

@ECHO OFF
set $FindStr=//packages/thirdparty/release/main.txt#10
set $ReplString=//packages/thirdparty/release/main.txt#15

setlocal enabledelayedexpansion
for /f "delims=" %%a in ('type testlog.txt') do (
   set $Ver=%%a
   set $Ver=!$Ver: =!
   If /i !$Ver!==%$FindStr% set $Ver=%$ReplString%
   echo !$Ver! ) >> testlog.txt

Borodin · Accepted Answer · 2015-03-10 21:01:05Z

3

I'm not sure what you mean by "ignoring spaces". I assume they are in the original file, so you can't ignore them.

In a Perl one-liner, this keeps whatever spaces were there before the #99 field, and changes it to #15.

perl -pe"s|//packages/thirdparty/release/main.txt\s*\K#\d+|#15|" testlog.txt

The \K ("keep") construct requires version 10 or later of Perl 5. If you have an earlier version and cannot update, then you can use a capture and replace instead, like this

perl -pe"s|(//packages/thirdparty/release/main.txt\s*)#\d+|$1#15|" testlog.txt

edited Mar 10, 2015 at 21:01

answered Mar 10, 2015 at 20:05

Borodin

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2 Comments

Mihir Over a year ago

For some reason it didn't work. It seems like something is missing.

ikegami Over a year ago

\K requires Perl 5.10 or newer.

ikegami · Accepted Answer · 2015-03-10 20:38:38Z

2

You could use a one line Perl:

perl -pe"s!(//packages/thirdparty/release/main.txt *)#\d+!$1#15!;" testlog.txt

replaces #10 by #15

edited Mar 10, 2015 at 20:38

ikegami

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answered Mar 10, 2015 at 20:02

Miguel Prz

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3 Comments

Mihir Over a year ago

thank you Miguel for replying, but #10 can be any number and i would only like to replace" //packages/thirdparty/release/main.txt #XX" with #15

Mihir Over a year ago

Thanks ikegami and Miguel.

Mihir Over a year ago

one more quick question, suppose "//packages/thirdparty/release/main.txt" is variable in bash script. How can i use it in above script?

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