Java正規表現APIをよく忘れるのでメモっとくよ

プログラムで使用するaaa.txt

neko\\inu\\saru\\kiji

実際のプログラム（junit4.8.2使用）

package kijitoraneko;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
import static org.junit.internal.matchers.IsCollectionContaining.*;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.junit.Test;

public class TestRegEx {

	@Test
	public void testStringMatches() {
		String regex1 = "neko inu saru kiji";
		String searchStr = "neko inu saru kiji";
		boolean bool = searchStr.matches(regex1);
		assertThat(bool, is(true));

		regex1 = "neko";
		searchStr = "neko inu saru kiji";
		bool = searchStr.matches(regex1);
		assertThat(bool, is(false));
	}

	@Test
	public void testStringSplit() {
		BufferedReader br = null;
		try {
			br = new BufferedReader(new FileReader("aaa.txt"));
			String regex = "\\\\\\\\";
			String line = br.readLine();
			String[] splited = line.split(regex);
			List<String> splitList = Arrays.asList(splited);
			String[] array = new String[] { "neko", "inu", "saru", "kiji" };
			List<String> asList = Arrays.asList(array);
			assertArrayEquals(array, splited);
			assertThat(splitList, hasItems(asList.get(0), asList.get(1), asList.get(2), asList.get(3)));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	@Test(expected = PatternSyntaxException.class)
	public void testStringSplitErr() {
		BufferedReader br = null;
		try {
			br = new BufferedReader(new FileReader("aaa.txt"));
			String regex = "\\";
			String line = br.readLine();
			line.split(regex);

		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	@Test
	public void testMatcherMatches() {
		String regex1 = "neko inu saru kiji";
		String searchStr = "neko inu saru kiji";
		Pattern pt = Pattern.compile(regex1);
		Matcher matcher = pt.matcher(searchStr);

		boolean bool = matcher.matches();
		assertThat(bool, is(true));

		regex1 = "neko";
		searchStr = "neko inu saru kiji";
		pt = Pattern.compile(regex1);
		matcher = pt.matcher(searchStr);

		boolean bool2 = matcher.matches();
		assertThat(bool2, is(false));

	}

	@Test
	public void testMatcherFind() {
		String regex1 = "inu";
		String searchStr = "neko inu saru kiji";
		Pattern pt = Pattern.compile(regex1);
		Matcher matcher = pt.matcher(searchStr);

		boolean bool = matcher.find();
		assertThat(bool, is(true));

		bool = matcher.find();
		assertThat(bool, is(false));

		matcher.reset();
		bool = matcher.find();
		assertThat(bool, is(true));
	}

	@Test
	public void testMatcherLookAt() {
		String regex1 = "inu";
		String searchStr = "neko inu saru kiji";
		Pattern pt = Pattern.compile(regex1);
		Matcher matcher = pt.matcher(searchStr);

		boolean bool = matcher.lookingAt();
		assertThat(bool, is(false));

		regex1 = "neko";
		searchStr = "neko inu saru kiji";
		pt = Pattern.compile(regex1);
		matcher = pt.matcher(searchStr);

		bool = matcher.lookingAt();
		assertThat(bool, is(true));

	}

	@Test
	public void testBackRefer() {
		String regex1 = "((neko).+)(\\2zura)";
		String searchStr = "neko inu saru kiji neko inu nekozura";
		Pattern pt = Pattern.compile(regex1);
		Matcher matcher = pt.matcher(searchStr);
		matcher.find();
		String all = matcher.group(0);
		String f = matcher.group(1);
		String b = matcher.group(3);
		assertThat(all, is("neko inu saru kiji neko inu nekozura"));
		assertThat(f, is("neko inu saru kiji neko inu "));
		assertThat(b, is("nekozura"));
	}

}