126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS in Java

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126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS
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Index: Target: Delimit: Pattern: Match: 0123456789012345678901234567890123 C:\Program Files\3MM\MSN2Lite\Help \\ [a-z[A-Z]]+ (30,33:Help)
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Multi-Line Mode
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If the input is line-oriented, the scanner can be used to perform search in the input one line at a time The methods hasNextLine(), findInLine(), and nextLine() form the trinity that implements the multi-line mode of searching the input with a pattern Example 1213 illustrates the basics of the multi-line use of a scanner The program processes a text file line by line, printing the names found in each line The program essentially comprises two nested loops: an outer loop to access the input one line at a time, and an inner loop to search for all names in this line The name of the source file is specified as a program argument at (1) The pattern that defines a name is specified at (2), and a scanner with the text file as the source is created at (3) The call to the lookahead method hasNextLine() at (4) checks to see if there is another line of input If that is the case, the findInLine() method is called at (5) to find the first match All characters in the line are treated as being significant by the findInLine() method, including the delimiters that are set for the scanner If a call to the findInLine() method results in a match, it advances the search past the matched input in the line and returns the matched input The value returned by the findInLine() method can be used as a condition in an inner loop to successively find remaining occurrences of the pattern in the line at (8) If no match is found in the line, the findInLine() method returns the value null and the search position remains unchanged The findInLine() method never reads past a line separator This means that the scanner does not budge if a match cannot be found in the line or if it has reached the end of the line A call to the nextLine() method at (9) reads the rest of the line, ie, any characters from the current position to the end of the line, including the line separator The scanner is thus poised to process the next line Since the findInLine() method only recognizes the line separator as a delimiter, absence of line separators in the input may result in buffering of the input while the scanner tries to match the search pattern
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String findInLine(Pattern pattern) String findInLine(String pattern)
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These methods attempt to find the next occurrence of the specified pattern or the pattern constructed from the specified string, respectively, ignoring any delimiters
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CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING
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Example 1213 Multi-Line Mode import static javalangSystemout; import import import import javaioFile; javaioIOException; javautilScanner; javautilregexPattern;
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class MultiLineMode { public static void main(String[] args) throws IOException { String source = args[0]; // (1) Filename from program args Pattern pattern = Patterncompile("[a-zA-Z]+", PatternMULTILINE);// (2) Search pattern Scanner lexer = new Scanner(new File(source));// (3) Create a scanner // Outer loop: while (lexerhasNextLine()) { // (4) Lookahead for next line String match = lexerfindInLine(pattern); // (5) Find the first match // Inner loop: while (match != null) { // (6) Parse rest of the line outprintln(match); // (7) Process the match match = lexerfindInLine(pattern); // (8) Get the next match } lexernextLine(); // (9) Clear rest of the line } IOException ioe = lexerioException(); if (ioe != null) // (10) Check for read problem throw ioe; lexerclose(); // (11) Close the scanner } }
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>java MultiLineMode MultiLineModejava import static scanner
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Review Questions
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127 Which statements are true about the following target string
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"oblaada oblaadi"
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Select the three correct answers (a) (b) (c) (d) The regular expression a+ will match two substrings of the target string The regular expression aa+ will match two substrings of the target string The regular expression (aa)+ will match two substrings of the target string The regular expressions aa+ and (aa)+ will match the same two substrings of the target string
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