Java中具有示例的Matcher useAnchoringBounds()方法
java.util.regex.Matcher类表示执行各种匹配操作的引擎。该类没有构造函数，可以使用matches()类java.util.regex.Pattern的方法创建/获取该类的对象。
锚定边界用于匹配区域匹配，例如^和$。默认情况下，匹配器使用锚定边界。
此类方法的useAnchoringBounds()方法接受一个布尔值，如果将true传递给此方法，则当前匹配器将使用定位范围；如果将false传递给此方法，则将使用非固定范围。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Trail {
public static void main( String args[] ) {
//读取字符串值
Scanner sc = new Scanner(System.in);
System.out.println("Enter input string");
String input = sc.nextLine();
//查找数字的正则表达式
String regex = ".*\\d+.*";
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//打印正则表达式
System.out.println("Compiled regular expression: "+pattern.toString());
//检索匹配器对象
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");
}
}
}输出结果
Enter input string sample Compiled regular expression: .*\d+.* Current matcher uses non-anchoring bounds
例子2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Sample {
public static void main( String args[] ) {
String regex = "^<foo>.*";
String input = "<foo><bar>";//Hi</i></br> welcome to Nhooo";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
matcher = matcher.useAnchoringBounds(false);
if(matcher.matches()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
System.out.println("Has anchoring bounds: "+matcher.hasAnchoringBounds());
}
}输出结果
Match found Has anchoring bounds: false