unicode-property-aliases-ecmascript
· Unicode property alias mappings in JavaScript format for property names that are supported in ECMAScript RegExp property escapes.
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 unicode-property-aliases-ecmascript-2.1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.