Main.java:42: error: cannot find symbol
if(!Pattern.matches("^[0-9]*$|^[A-F]*$",Character.toString(hex.charAt(i))))
^
symbol: variable Pattern
location: class HexFormat
Main.java:47: error: cannot find symbol
if(!Pattern.matches("^[0-9]*$|^[A-F]*$|^[A-F0-9]*$",hex))
^
symbol: variable Pattern
location: class HexFormat
2 errors