asp.net mvc - Regular exception.Any character except -

i want

input :www.example.com/videos/video1%2cvideo2%2cvideo3%2cvideo4%2c output:www.example.com/videos/video1,video2,video3,vide4

so need regular expression. tried this:^videos/[%2c](in iss url rewriting pattern). not not work. said input data test not match patter.

there similar question posted. trying using answers suggested in post. find link here: iis7 url rewriting module replace