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Javaで「CASE_INSENSITIVEフラグ(大文字と小文字を区別しない)」の動作を確認してみた

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概要

Javaで「CASE_INSENSITIVEフラグ(大文字と小文字を区別しない)」の動作を確認してみました。
以下のページを参考にしました。

実装

以下のファイルを作成しました。

JSample17_1.java
import java.util.regex.*;

class JSample17_1{
  public static void main(String[] args){
    String[] target = {"apple", "Apple", "APPLE"};

    String regex = "apple";
    Pattern p1 = Pattern.compile(regex);

    for (int i = 0; i < target.length ; i++){
      Matcher m = p1.matcher(target[i]);
      System.out.println(target[i] + ":" + m.find());
    }

    System.out.println("---- ----");

    Pattern p2 = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);

    for (int i = 0; i < target.length ; i++){
      Matcher m = p2.matcher(target[i]);
      System.out.println(target[i] + ":" + m.find());
    }
  }
}

以下のコマンドを実行しました。

$ javac JSample17_1.java 
$ java JSample17_1 
apple:true
Apple:false
APPLE:false
---- ----
apple:true
Apple:true
APPLE:true

まとめ

何かの役に立てばと。

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