How to replace a number using regular expressions?

Question

Regular Expressions

There are styles, you need to divide all values ​​in rem by 10, for example

.btn{
  height: 40rem;
  border-radius: 20rem;	
  font-size: 18rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0 25rem;
  }

should work

.btn{
  height: 4rem;
  border-radius: 2rem;	
  font-size: 1.8rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0 2.5rem;
  }

the styles are very large so it will take a very long time to manually

Answer 1

Regular expressions can find and replace text, but they cannot divide.
so you have to script. for example, so .

Answer 2

for example like this:

#!/usr/bin/perl
($_='some text with numbers 10, 6, 7, 2.5 and nothing more')=~s~([.\d]+)~$1*++$?~ge;print