What regular expression to use for replacement in Notepad?

Question

Regular Expressions

Hello everyone,
in general, it is necessary to replace all vertical lines with a comma, while leaving the first line in the line.
Example:
Now: abbreviated|skimpy|brief|revealing Needed
: abbreviated|skimpy,brief,revealing

Answer 1

Specifically for this case - for example, like this:
Search for:
Replace with:
$1|$2,$3,$4