The start() method of MatchResult Interface is used to get the start index of the match result already done.
Syntax:
public int start()
Parameters: This method do not takes any parameter.
Return Value: This method returns the index of the first character matched.0
Exception: This method throws IllegalStateException if no match has yet been attempted, or if the previous match operation failed.
Below examples illustrate the MatchResult.start() method:
Example 1:
// Java code to illustrate start() method import java.util.regex.*; public class GFG { public static void main(String[] args) { // Get the regex to be checked String regex = "(G*k)"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "Geeks"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); while (((Matcher)matcher).find()) { // Get the first index of match result System.out.println(matcher.start()); } }} |
Output:
3
Example 2:
// Java code to illustrate start() method import java.util.regex.*; public class GFG { public static void main(String[] args) { // Get the regex to be checked String regex = "(G*G)"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "GFG"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); while (((Matcher)matcher).find()) { // Get the first index of match result System.out.println(matcher.start()); } }} |
Output:
0 2
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