Java正規表現サンプルメモ

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class MatchSample {

	public static void main(String[] args) {

		String txt = "pokemon, pikachu, fire45, thunder";

		String regex = "([a-z0-9]+), ([a-z0-9]+), ([a-z0-9]+), ([a-z0-9]+)";

		Pattern p = Pattern.compile(regex);
		Matcher m = p.matcher(txt);
		while(m.find()){

			System.out.println("GROUP COUNT = " + m.groupCount());

			for(int j = 1; j <= m.groupCount(); j++) {

				System.out.println("j = "+ j + "--" +  m.group(j));

			}

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

		String regex1 = "([a-z0-9]+)+";

		p = Pattern.compile(regex1);
		m = p.matcher(txt);
		while(m.find()){

			System.out.println("GROUP COUNT = " + m.groupCount());

			for(int j = 1; j <= m.groupCount(); j++) {

				System.out.println("j = "+ j + "--" +  m.group(j));

			}

		}
	}

}

//結果
GROUP COUNT = 4
j = 1--pokemon
j = 2--pikachu
j = 3--fire45
j = 4--thunder

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • -

GROUP COUNT = 1
j = 1--pokemon
GROUP COUNT = 1
j = 1--pikachu
GROUP COUNT = 1
j = 1--fire45
GROUP COUNT = 1
j = 1--thunder