How to use regex to get file extension? [duplicate]

Answer 1

You could use String class split() function. Here you could pass a regular expression. In this case, it would be "\.". This will split the string in two parts the second part will give you the file extension.

public class Sample{
  public static void main(String arg[]){
    String filename= "c:\\abc.txt";

    String fileArray[]=filename.split("\\.");

    System.out.println(fileArray[fileArray.length-1]); //Will print the file extension
  }
}