How do I use regex to get a file extension?
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How do I use regex to get a file extension?
This question already has an answer here:
- Java: splitting the filename into a base and extension 8 answers
I'm trying extract a substring from a string that contains a filename or directory. The substring being extracted should be the file extension. I've done some searching online and discovered I can use regular expressions to accomplish this. I've found that ^\.[\w]+$ is a pattern that will work to find file extensions. The problem is that I'm not fully familiar with regular expressions and its functions.
Basically If i have a string like C:\Desktop\myFile.txt I want the regular expression to then find and create a new string containing only .txt
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
}
}
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