Java 中 Matcher regionEnd()方法，带示例
原文:https://www . geesforgeks . org/matcher-regionend-method-in-Java-with-examples/
匹配器类的 regionEnd() 方法用于获取当前匹配器中模式要匹配的区域的 endIndex。这个方法返回一个整数值，它是这个匹配器区域的 endIndex。
语法:
public int regionEnd()
参数:该方法不取参数。
返回值:这个方法返回一个整数值，它是这个匹配器区域的 endIndex。
以下示例说明了 Matcher.regionEnd()方法:
例 1:
// Java code to illustrate regionEnd() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(Geeks)";
// Create a pattern from regex
Pattern pattern = Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GeeksForGeeks Geeks for For Geeks Geek";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
// Get previous endIndex of region
// using regionEnd() method
System.out.println("Before changing region, "
+ " Region ends from: "
+ matcher.regionEnd());
// Restrict the region to 0, 10
matcher = matcher.region(0, 10);
// Get previous endIndex of region
// using regionEnd() method
System.out.println("After changing region, "
+ " Region ends from: "
+ matcher.regionEnd());
}
}
输出:
Before changing region, Region ends from: 38
After changing region, Region ends from: 10
例 2:
// Java code to illustrate regionEnd() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(F*F)";
// Create a pattern from regex
Pattern pattern = Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
// Get previous endIndex of region
// using regionEnd() method
System.out.println("Before changing region, "
+ " Region ends from: "
+ matcher.regionEnd());
// Restrict the region to 0, 5
matcher = matcher.region(0, 5);
// Get previous endIndex of region
// using regionEnd() method
System.out.println("After changing region, "
+ " Region ends from: "
+ matcher.regionEnd());
}
}
输出:
Before changing region, Region ends from: 35
After changing region, Region ends from: 5
参考:https://docs . Oracle . com/javase/9/docs/API/Java/util/regex/matcher . html # regionEnd–
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