Replace a string between two strings with regex

Question

I have the following regex:

(\<parent\>(?s).*\<version\>).*(\<\/version\>(?s).*\<\/parent\>)

Which should work on the following text:

<name>CTR</name>

<!-- Parent -->
<parent> 
    <groupId>cxxdsds</groupId>
    <artifactId>c222</artifactId>       
    <version>5.0.0-REPO</version>
</parent>

<scm>

I want to replace the string between <version> and <version>. But my sed does not work: sed -i 's/(\<parent\>(?s).*\<version\>).*(\<\/version\>(?s).*\<\/parent\>)/\1xxxxxxx\2/g' pom.xml Any ideas?

sed works on a single line only by default, (?s) isn't supported (see Why does my regular expression work in X but not in Y? for details), etc. I'd also suggest to use tools like xmlstarlet instead of sed — Sundeep
– Sundeep, Commented Jul 5, 2021 at 14:17

RavinderSingh13 · Accepted Answer · 2021-07-05 14:18:14Z

1

With your shown samples, you could try following sed code for substitution.

sed 's/\(<version>\)[^<]*\(<.*\)/\1xxxxxxx\1/' Input_file

Explanation: Simple explanation would be, using sed's back reference capability to store <version> and </version> in 2 different capturing groups and then while performing substitution adding new value xxxxxxx between 2 capturing groups as per required output.

2nd solution: Using awk in case you want to look for tag <parent> as per shown samples and you want to replace version only in it then try following.

awk '
/<parent>/ { found=1 }
/<version>/{
  line=$0
  next
}
/<\/parent>/ && found{
  if(line){
    sub(/>.*</,">xxxxxxx<",line)
  }
  print line ORS $0
  line=found=""
  next
}
1
' Input_file

edited Jul 5, 2021 at 14:18

answered Jul 5, 2021 at 14:11

RavinderSingh13

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