Check for a Substring after a particular occurrence of string which is separated by dots-CodePudding

I have a string with dots. I want to get a particular substring after occurrence of word

entity

that is for example

String givenStr = "com.web.rit.entity.TestName.create";
output - TestName

String givenStr = "com.web.rit.entity.TestName2.update";
output - TestName2

So as explained above I have to extract substring after the string entity from the given string. Can anyone please help? (I am using java to do it).

CodePudding user response：

You can do something like this :

String givenStr = "com.web.rit.entity.TestName.create"; // begin str
String wording = "entity"; // looking for begin
String[] splitted = givenStr.split("\\."); // get all args
for(int i = 0; i < splitted.length; i  ) {
    if(splitted[i].equalsIgnoreCase(wording)) { // checking if it's what is required
        System.out.println("Output: "   splitted[i   1]); // should not be the last item, else you will get error. You can add if arg before to fix it
        return;
   }
}

CodePudding user response：

You can use 2 splits.

String word = givenStr.split("entity.")[1].split("\\.")[0];

Explaination:

Assuming the givenStr is "com.web.rit.entity.TestName.create"

givenStr.split("entity.")[1] // Get the sentence after the entity.

"TestName.create"

split("\\.")[0] // Get the string before the '.'

TestName

CodePudding user response：

Here's a streams solution (Java 9 minimum requirement):

Optional<String> value = Arrays
     .stream("com.web.rit.entity.TestName.create".split("\\."))
     .dropWhile(s -> !s.equals("entity"))
     .skip(1)
     .findFirst();

System.out.println(value.orElse("not found"));