Question

I have a list that contains a comma but I also have others commas in the same list I dont want to remove, so I wonder is there a way to only delete the last comma of every line of text?

Answer 1

If you mean remove the last character if it is a comma, then you should do something like
replace
^(.*),$ with $1

a,b,c, will be replaced to a,b,c, and a,b,c,d will not match the regex.

If you means just remove the last comma, even there are something after it, do something like replace ^(.*),([^,]*)$ with $1$2

a,b,c, will be replaced to a,b,c, and a,b,c,d will be replaced to a,b,cd