fill-range
· Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window fill-range-7.0.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
