Java中的Matcher reset()方法与示例


Matcher reset() method in Java with Examples

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，可以使用类java.util.regex.Pattern的matchs()方法创建/获取该类的对象。

这个(Matcher)类的reset()方法删除所有状态信息，并将字符序列重置为默认值，并将位置附加到零。

例1

<！-

现场演示

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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
 public static void main(String[] args) {
   String str ="<p>
This is an exampleHTML script where every alternative word is bold
</p>.";
   //Regular expression to match contents of the bold tags
   String regex ="(\\S+)";
   //Creating a pattern object
   Pattern pattern = Pattern.compile(regex);
   //Matching the compiled pattern in the String
   Matcher matcher = pattern.matcher(str);
   while (matcher.find()) {
    System.out.println("State of the matcher:"+matcher.toMatchResult());
    String result = matcher.group(1);
   }
   matcher = matcher.reset();
   System.out.println("State of the matcher after resetting it:"+matcher.toMatchResult());
 }
}

输出量

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State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=is]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=example]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=script]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=every]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=>word]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=bold]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=]
State of the matcher after resetting it: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=]

此方法的另一个变体接受字符串数据并使用它重置Matcher。

例子2

<！-

现场演示

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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
 public static void main(String[] args) {
   String str ="<p>
This is an example HTML script where every alternative word is bold
</p>.";
   //Regular expression to match contents of the bold tags
   String regex ="(\\S+)";
   //Creating a pattern object
   Pattern pattern = Pattern.compile(regex);
   //Matching the compiled pattern in the String
   Matcher matcher = pattern.matcher(str);
   while (matcher.find()) {
    System.out.println("State of the matcher:"+matcher.toMatchResult());
    String result = matcher.group(1);
   }
   matcher = matcher.reset("this is new string after reset");
   while (matcher.find()) {
    System.out.println("State of the matcher after resetting it:"+matcher.toMatchResult());
   }
 }
}

输出量

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State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=is]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=example]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=script]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=every]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=word]
State of the matcher: java.util.regex.Matcher[pattern=(\S+) region=0,116 lastmatch=bold]
State of the matcher after resetting it: java.util.regex.Matcher[pattern=(\S+) region=0,51 lastmatch=this]
State of the matcher after resetting it: java.util.regex.Matcher[pattern=(\S+) region=0,51 lastmatch=new]
State of the matcher after resetting it: java.util.regex.Matcher[pattern=(\S+) region=0,51 lastmatch=after]