Examples of java.util.regex.MatchResult.start()

java.util.regex.MatchResult.start()
Returns the start index of the match. @return The index of the first character matched @throws IllegalStateException If no match has yet been attempted, or if the previous match operation failed

        s = new Scanner("aa\n\rb");
        String patternStr = "^(a)$";
        result = s.findWithinHorizon(Pattern.compile("a"), 5);
        assertEquals("a", result);
        mresult = s.match();
        assertEquals(0, mresult.start());
        assertEquals(1, mresult.end());


        result = s.findWithinHorizon(Pattern.compile(patternStr,
                Pattern.MULTILINE), 5);
        assertNull(result);

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        s = new Scanner("");
        result = s.findWithinHorizon(Pattern.compile("^"), 0);
        assertEquals("", result);
        MatchResult matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());


        result = s.findWithinHorizon(Pattern.compile("$"), 0);
        assertEquals("", result);
        matchResult = s.match();

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        assertEquals(0, matchResult.end());


        result = s.findWithinHorizon(Pattern.compile("$"), 0);
        assertEquals("", result);
        matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());


        s = new Scanner("1 fish 2 fish red fish blue fish");
        result = s.findWithinHorizon(Pattern
                .compile("(\\d+) fish (\\d+) fish (\\w+) fish (\\w+)"), 10);

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            // Expected
        }
        String result = s.findInLine(Pattern.compile("^"));
        assertEquals("", result);
        MatchResult matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());


        result = s.findInLine(Pattern.compile("$"));
        assertEquals("", result);
        matchResult = s.match();

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        assertEquals(0, matchResult.end());


        result = s.findInLine(Pattern.compile("$"));
        assertEquals("", result);
        matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());


        /*
         * When we use the operation of findInLine(Pattern), the match region
         * should not span the line separator.

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        s = new Scanner("abcd1234test\n");
        result = s.findInLine(Pattern.compile("\\p{Lower}+"));
        assertEquals("abcd", result);
        matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(4, matchResult.end());


        result = s.findInLine(Pattern.compile("\\p{Digit}{5}"));
        assertNull(result);
        try {

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            matchResult = s.match();
            fail("Should throw IllegalStateException");
        } catch (IllegalStateException e) {
            // expected
        }
        assertEquals(0, matchResult.start());
        assertEquals(4, matchResult.end());


        result = s.findInLine(Pattern.compile("\\p{Lower}+"));
        assertEquals("test", result);
        matchResult = s.match();

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        assertEquals(4, matchResult.end());


        result = s.findInLine(Pattern.compile("\\p{Lower}+"));
        assertEquals("test", result);
        matchResult = s.match();
        assertEquals(8, matchResult.start());
        assertEquals(12, matchResult.end());


        char[] chars = new char[2048];
        Arrays.fill(chars, 'a');
        StringBuilder stringBuilder = new StringBuilder();

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        stringBuilder.append("1234");
        s = new Scanner(stringBuilder.toString());
        result = s.findInLine(Pattern.compile("\\p{Digit}+"));
        assertEquals("1234", result);
        matchResult = s.match();
        assertEquals(2048, matchResult.start());
        assertEquals(2052, matchResult.end());


        s = new Scanner("test");
        s.close();
        try {

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        s = new Scanner("test1234\n1234 test");
        result = s.findInLine(Pattern.compile("test"));
        assertEquals("test", result);
        matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(4, matchResult.end());


        int number = s.nextInt();
        assertEquals(1234, number);
        matchResult = s.match();

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