Examples of java.util.Scanner.findInLine()

java.util.Scanner.findInLine()
Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.
An invocation of this method of the form findInLine(pattern) behaves in exactly the same way as the invocation findInLine(Pattern.compile(pattern)). @param pattern a string specifying the pattern to search for @return the text that matched the specified pattern @throws IllegalStateException if this scanner is closed

     */
    public void test_findInLine_LPattern() {


        Scanner s = new Scanner("");
        try {
            s.findInLine((Pattern) null);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // Expected
        }
        String result = s.findInLine(Pattern.compile("^"));

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            s.findInLine((Pattern) null);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // Expected
        }
        String result = s.findInLine(Pattern.compile("^"));
        assertEquals("", result);
        MatchResult matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());

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        assertEquals("", result);
        MatchResult matchResult = s.match();
        assertEquals(0, matchResult.start());
        assertEquals(0, matchResult.end());


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

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        /*
         * When we use the operation of findInLine(Pattern), the match region
         * should not span the line separator.
         */
        s = new Scanner("aa\nb.b");
        result = s.findInLine(Pattern.compile("a\nb*"));
        assertNull(result);


        s = new Scanner("aa\nbb.b");
        result = s.findInLine(Pattern.compile("\\."));
        assertNull(result);

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        s = new Scanner("aa\nb.b");
        result = s.findInLine(Pattern.compile("a\nb*"));
        assertNull(result);


        s = new Scanner("aa\nbb.b");
        result = s.findInLine(Pattern.compile("\\."));
        assertNull(result);


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

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        s = new Scanner("aa\nbb.b");
        result = s.findInLine(Pattern.compile("\\."));
        assertNull(result);


        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());

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        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 {
            matchResult = s.match();
            fail("Should throw IllegalStateException");
        } catch (IllegalStateException e) {

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            // expected
        }
        assertEquals(0, matchResult.start());
        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());

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        Arrays.fill(chars, 'a');
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(chars);
        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());

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        assertEquals(2052, matchResult.end());


        s = new Scanner("test");
        s.close();
        try {
            s.findInLine((Pattern) null);
            fail("Should throw IllegalStateException");
        } catch (IllegalStateException e) {
            // expected
        }

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