例を使用したJavaのマッチャーreset（）メソッド

java.util.regex.Matcher classは、さまざまな一致操作を実行するエンジンを表します。このクラスのコンストラクターはありません。クラスjava.util.regex.Patternのmatches（）メソッドを使用して、このクラスのオブジェクトを作成/取得できます。

この（Matcher）クラスのreset（）メソッドは、すべての状態情報を削除し、文字シーケンスをデフォルトにリセットし、位置をゼロに追加します。

例1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
   public static void main(String[] args) {
      String str = "<p>This <b>is</b> an <b>example</b>HTML <b>script</b> where <b>every</b> alternative <b>word</b> is <b>bold</b></p>.";
      //Regular expression to match contents of the bold tags
      String regex = "<b>(\\S+)</b>";
      //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());
   }
}

出力

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

このメソッドの別の変形は、文字列データを受け入れ、それを使用してマッチャーをリセットします。

例2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
   public static void main(String[] args) {
      String str = "<p>This <b>is</b> an <b>example</b> HTML <b>script</b> where <b>every</b> alternative <b>word</b> is <b>bold</b></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("<b>this</b> is <b>new</b> string <b>after</b> reset");
      while (matcher.find()) {
         System.out.println("State of the matcher after resetting it: "+matcher.toMatchResult());
      }
   }
}

出力

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