Java中具有示例的Matcher hasAnchoringBounds()方法
java.util.regex.Matcher类表示执行各种匹配操作的引擎。此类没有构造函数，可以使用类java.util.regex.Pattern的matchs()方法创建/获取此类的对象。
锚定边界用于匹配区域匹配，例如^和$。默认情况下，匹配器使用锚定范围，您可以使用useAnchoringBounds()方法从使用锚定范围切换到非锚定范围。
此(Matcher)类的hasAnchoringBounds()方法验证当前匹配器是否使用锚定边界（如果是），否则返回true，否则返回false。
例子1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HasAnchoringBoundsExample {
public static void main(String[] args) {
String regex = "(.*)(\\d+)(.*)";
String input = "This is a sample Text, 1234, with numbers in between. "
+ "\n This is the second line in the text "
+ "\n This is third line in the text";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(input);
//Verifying for anchoring bounds
boolean bool = matcher.hasAnchoringBounds();
//checking for the match
if(bool) {
System.out.println("Current matcher uses anchoring bounds");
} else {
System.out.println("Current matcher uses non-anchoring bounds");
}
if(matcher.matches()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
}
}输出结果
Current matcher uses anchoring bounds Match not found
例子2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Trail {
public static void main( String args[] ) {
//Reading string value
Scanner sc = new Scanner(System.in);
System.out.println("Enter input string");
String input = sc.nextLine();
//Regular expression to find digits
String regex = ".*\\d+.*";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Printing the regular expression
System.out.println("Compiled regular expression: "+pattern.toString());
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
matcher.useAnchoringBounds(false);
boolean hasBounds = matcher.hasAnchoringBounds();
if(hasBounds) {
System.out.println("Current matcher uses anchoring bounds");
} else {
System.out.println("Current matcher uses non-anchoring bounds");
}
//verifying whether match occurred
if(matcher.matches()) {
System.out.println("Given String contains digits");
} else {
System.out.println("Given String does not contain digits");
}
}
}输出结果
Enter input string hello sample 2 Compiled regular expression: .*\d+.* Current matcher uses non-anchoring bounds Given String contains digits