Java 中的 MatchResult start()方法，示例
原文:https://www . geesforgeks . org/match result-start-method-in-Java-with-examples/
匹配结果界面的 start() 方法用于获取已经完成的匹配结果的开始索引。
语法:
public int start()
参数:该方法不取任何参数。
返回值:该方法返回匹配的第一个字符的索引。0
异常:如果还没有尝试匹配，或者如果之前的匹配操作失败，此方法将抛出illegalstatexception。
下面的例子说明了 MatchResult.start()方法:
例 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());
}
}
}
输出:
3
例 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());
}
}
}
输出:
0
2
=
版权属于：月萌API www.moonapi.com，转载请注明出处
