Matcher start() method in Java with Examples Last Updated : 26 Nov, 2018 Comments Improve Suggest changes Like Article Like Report The start() method of Matcher Class 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 Matcher.start() method: Example 1: Java // 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 Matcher matcher = pattern .matcher(stringToBeMatched); // Get the current matcher state MatchResult result = matcher.toMatchResult(); System.out.println("Current Matcher: " + result); while (matcher.find()) { // Get the first index of match result System.out.println(matcher.start()); } } } Output: Current Matcher: java.util.regex.Matcher[pattern=(G*k) region=0,5 lastmatch=] 3 Example 2: Java // 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 Matcher matcher = pattern .matcher(stringToBeMatched); // Get the current matcher state MatchResult result = matcher.toMatchResult(); System.out.println("Current Matcher: " + result); while (matcher.find()) { // Get the first index of match result System.out.println(matcher.start()); } } } Output: Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0,3 lastmatch=] 0 2 Reference: Oracle Doc Comment More infoAdvertise with us Next Article Matcher start() method in Java with Examples K Kirti_Mangal Follow Improve Article Tags : Java Java - util package Java-Functions Java-Matcher Practice Tags : Java Similar Reads Matcher start(int) method in Java with Examples The start(int group) method of Matcher Class is used to get the start index of the match result already done, from the specified group. Syntax: public int start(int group) Parameters: This method takes a parameter group which is the group from which the start index of the matched pattern is required 2 min read MatchResult start() method in Java with Examples 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 Illeg 2 min read Matcher regionStart() method in Java with Examples The regionStart() method of Matcher Class is used to get the startIndex of the region to be matched by the pattern in the current matcher. This method returns an integer value which is the startIndex of the region of this matcher. Syntax: public int regionStart() Parameters: This method takes no par 2 min read Matcher reset() Method in Java with Examples The reset() method of Matcher Class is used to reset this matcher, in order to understand it better it is recommended to have prior knowledge of Pattern and Matcher class in java regex sub-package. Here we will be illustrating it with help of Java programs. Syntax: public Matcher reset() Parameters: 2 min read Matcher start(String) method in Java with Examples The start(String string) method of Matcher Class is used to get the start index of the match result already done, from the specified string. Syntax: public int start(String string) Parameters: This method takes a parameter string which is the String from which the start index of the matched pattern 2 min read Like