sed正则表达式匹配不起作用

Question

I want to update the year in licence header of the source code in many files. I am writing bash sript for that. However the sed command is not working. In particular, the regex fails to match and replace the desired word.

Example: mycode.h

<Some Multi Line text>
Copyright 2002-2014 Utkrist Adhikari
<Some Multi Line text>

Lets say I want to replace 2014 by 2015 ( END_DATE=2015 ). I am trying to achieve it with following command:

sed -i -r "s/\(Copyright.*\)-[ ]*[0-9]+[ ]*\( Utkrist Adhikari\)/\1$END_DATE\2/" mycode.h

OR

sed '/Copyright/,/Peter Baumann/ {s/-[ ]*[0-9]+[ ]*/$END_DATE/}' $file

Basically, I am trying to match

• Copyright at the beginning of the line;
• -[optional_spaces]some_integer[optional_spaces] in between
• [one_space]Utkrist Adhikari at the end of the line

I would then like to replace the middle part with content of the variable END_DATE

Answer 1

You could try the below GNU sed command,

$ END_DATE=2015; sed -r "s/^(Copyright\s*[0-9]{4}-)[0-9]{4}(\s*Utkrist\s*Adhikari)/\1$END_DATE\2/g" file
<Some Multi Line text>
Copyright 2002-2015 Utkrist Adhikari
<Some Multi Line text>

Answer 2

sed -r "s/^(Copyright 2002-)[0-9]{4}( Utkrist Adhikari)$/\1$END_DATE\2/" mycode.h

Answer 3

Here is a simple way to do it with awk

awk '/Copyright/ {sub(/-[0-9]*/,"-2015")}1' file
<Some Multi Line text>
Copyright 2002-2015 Utkrist Adhikari
<Some Multi Line text>

When data comes from a variable:

END_DATE=2015
awk -v d="$END_DATE" '/Copyright/ {sub(/-[0-9]*/,"-"d)}1' file
<Some Multi Line text>
Copyright 2002-2015 Utkrist Adhikari
<Some Multi Line text>