MatchResult start(int) method in Java with Examples
Last Updated :
27 Nov, 2018
The start(int group) method of MatchResult Interface 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.
Return Value: This method returns the index of the first character matched from the specified group.
Exception: This method throws:
- IllegalStateException if no match has yet been attempted, or if the previous match operation failed.
- IndexOutOfBoundsException if there is no capturing group in the pattern with the given index.
Below examples illustrate the MatchResult.start() method:
Example 1:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(G*s)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "GeeksForGeeks" ;
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
while (((Matcher)matcher).find()) {
System.out.println(matcher.start( 1 ));
}
}
}
|
Example 2:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(G*G)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG" ;
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
while (((Matcher)matcher).find()) {
System.out.println(matcher.start( 0 ));
}
}
}
|
Output:
0
2
4
6
8
10
12
14
16
18
=
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