使用示例说明 Java 中 Matcher useAnchoringBounds() 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 java.util.regex.Pattern 类的 matches() 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,匹配器会使用锚定边界。
此类的 useAnchoringBounds() 方法接受一个布尔值,如果你将 true 传递给此方法时,当前匹配器将使用锚定边界,如果你将 false 传递给此方法时,它将使用非锚定边界。
示例 1
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"); } } }
输出
Enter input string sample Compiled regular expression: .*\d+.* Current matcher uses non-anchoring bounds
示例 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 Tutorialspoint"; 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
Match found Has anchoring bounds: false
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