don't strip "/" in string data

I have a Problem for input containing "/"   like formatted dates (01/01/1970)

My suggestion for the fix is to reformulate the cleanup regular expressions by simply grouping the comment identifier. An example can be reviewed on following debuggex https://www.debuggex.com/r/ZKeWxc6sKlPLuD_H 

So maybe the proposed change can be merged in.