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Hi @Remdore,
I think you need to better understand Regex and how it works.
$\ will be undefined and will do nothing in your regular expression.
.+_ will match everything from the beginning of a string to the last _ character, including the path information. You’ll want to use a more restrictive expression that won’t capture the whole path.
There are a few ways you can do it:
s![^/]+_!! greedy match of consecutive non-/ chars
s!(.+/)?.+_!$1! capture path and include it in the replacement
There is also a solution that would use a negative look-behind assertion, when you are ready to dive in the deep water.
Regards, KDSys