How to find the last index using regex of a particular word in a String?
To find the last index of a particular word in a string using regular expressions in Java, you can use the Matcher class along with a regular expression that captures the desired word.
Java Program to last index Using the Regex of a Particular Word in a String
Below is the implementation of the last index Using the Regex of a Particular Word in a String:
Java
// Java Program to Find last index // Using the Regex of a Particular Word in a String import java.util.regex.Matcher; import java.util.regex.Pattern; // Driver Class public class LastIndexOfWordUsingRegex { // Main Function public static void main(String[] args) { String inputString = "This is a sample sentence with a particular word. Another occurrence of the word."; // Specify the word you want to find String wordToFind = "word"; // Create a pattern with the word and the end-of-input anchor String regex = "\\b" + Pattern.quote(wordToFind) + "\\b"; Pattern pattern = Pattern.compile(regex); // Create a matcher for the input string Matcher matcher = pattern.matcher(inputString); // Find the last occurrence of the word int lastIndex = -1; while (matcher.find()) { lastIndex = matcher.start(); } // Print the last index or indicate if the word is not found if (lastIndex != -1) { System.out.println("Last index of '" + wordToFind + "': " + lastIndex); } else { System.out.println("'" + wordToFind + "' not found in the string."); } } } |
Output:
Last index of 'word': 76
Explanation of the above Program:
- The regular expression \\b is used to denote a word boundary.
- Pattern.quote(wordToFind) is used to escape any special characters in the word.
- The end-of-input anchor $ is used to ensure that the match occurs at the end of the input.
- The Matcher iterates through the input string using find(), updating the lastIndex each time a match is found.
Note: This approach assumes that you want to match whole words. If you want to find occurrences within other words, you may need to adjust the regular expression accordingly.
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