Java: Getting a Substring from a String Starting After a Particular Character

Java: Extract characters after a specific character

When the case is as simple as just getting anything after a given character, you don't really need regular expressions.

Example

String test = "http://www.example.com/abc?page=6";
String number = test.substring(test.lastIndexOf("=") + 1);
System.out.println(number);

Output

6

Note

If your String does not contain the = character, the result will be the whole String.

That'll happen because method lastIndexOf will return - 1, which is summed with +1 in the example, hence returning 0.

In short, it would return a sub-string of your whole String starting at 0 and extending to the whole length of the original String.

Getting a substring from a string after a particular word

yourString.substring(yourString.indexOf("no") + 3 , yourString.length());

Java : Getting a substring from a string after certain character

Assuming that "temp_username_current_timestamp" is not known and is expected to be different every time but you know the word or specific character that precedes what you want to extract, you should use indexOf(String str):

String input = "create table temp_username_current_timestamp other params"
String precedes = "table";
String extracted;

//Get the index of the start of the word to extract
int startIndex = input.indexOf(precedes) + precedes.length;
//Check if the word we are looking for is even there
if(startIndex > -1){
    //Get the index of the next space character
    int endIndex = input.indexOf(" ", startIndex);

    //If there are more parameters following ignore them
    if(endIndex > -1){
        //Extract the parameter given the indexes found
        extracted = input.substring(startIndex, endIndex);  
    } else {
        //If we are at the end of the string just extract what remains
        extracted = input.substring(startIndex);
    }
}

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

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;
   }
}

how to find before and after sub-string in a string

You can use String.split(String regex). Just do something like this:

String s = "123dance456";
String[] split = s.split("dance");
String firstSubString = split[0];
String secondSubString = split[1];

Please note that if "dance" occurs more than once in the original string, split() will split on each occurrence -- that's why the return value is an array.

Java: Getting a substring from a string in Text file starting after a special word

please try below code.

public static void main(String[] args)throws Exception 
      { 
      File file = new File("/root/test.txt"); 

      BufferedReader br = new BufferedReader(new FileReader(file)); 

      String st; 
      while ((st = br.readLine()) != null) {

          if(st.lastIndexOf("Name:") >= 0 || st.lastIndexOf("Age:") >= 0) {
              System.out.println(st.substring(st.lastIndexOf(":")+1));
          }
      }
      }

In java how to get substring from a string till a character c?

look at String.indexOf and String.substring.

Make sure you check for -1 for indexOf.

How to grab substring after a specific word in java

You can use indexOf and substring. First get the start of the link by getting the index of "https://twitter.com/". Then you look for a space after the beginning of the link, if one exists link ends there, otherwise it ends at the end of the message. Then we can use the substring method to get the link:

int startIndex = message.indexOf("https://twitter.com/");
int endIndex = message.indexOf(" ", startIndex);
if (endIndex == -1) {
    endIndex = message.length();
}
String link = message.substring(startIndex, endIndex);

Another easy way, split everything by space and check if they match the requirements:

String[] words = message.split(" ");
for (String word : words) {
    if (word.startsWith("https://twitter.com/")) {
        // ...
    }
}

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