Returns the regular expression string from which this pattern was compiled in Java

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Returns the regular expression string from which this pattern was compiled
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126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS
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Creating a Matcher
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The matcher() method returns a Matcher, which is the engine that does the actual pattern matching This method does not apply the underlying pattern to the specified input The matcher provides special operations to actually do the pattern matching
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Matcher dateMatcher = datePatternmatcher("01-03-49 786 09-09-09");
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The Pattern class also provides a static convenience method that executes all the steps outlined above for pattern matching The regular expression string and the input are passed to the static method matches(), which does the pattern matching on the entire input The regular expression string is compiled and the matcher is created each time the method is called Calling the matches() method is not recommended if the pattern is to be used multiple times
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boolean dateFound = Patternmatches("\\d\\d-\\d\\d-\\d\\d", "01-03-49"); // true
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Matcher matcher(CharSequence input)
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Creates a matcher that will match the specified input against this pattern
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static boolean matches(String regexStr, CharSequence input)
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Compiles the specified regular expression string and attempts to match the specified input against it The method only returns true if the entire input matches the pattern
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Splitting
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The normal mode of pattern matching is to find matches for the pattern in the input In other words, the result of pattern matching is the sequences of characters (ie, the matches, also called groups) that match the pattern Splitting returns sequences of characters that do not match the pattern In other words, the matches are spliced out and the sequences of non-matching characters thus formed from the input are returned in an array of type String The pattern is used as a delimiter to tokenize the input The token in this case is a sequence of non-matching characters, possibly the empty string The classes StringTokenizer and Scanner in the javautil package also provide the functionality for tokenizing text-based input See the subsection The javautilScanner Class, p 571 The example below shows the results from splitting an input on a given pattern The input is a | -separated list of names The regular expression string is "\\|", where the metacharacter | is escaped in order to use it as a non-metacharacter Splitting the given input according to the specified regular expression, results in the array of String shown below
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Input: "tom|dick|harry" Split: "\\|" Results: { "tom", "dick", "harry" }
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The split() method can be called on a pattern to create an array by splitting the input according to the pattern Each successful application of the pattern, meaning each match of the pattern delimiter in the input, results in a split of the input, with
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CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING
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the non-matched characters before the match resulting in a new element in the array, and any remaining input being returned as the last element of the array
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String[] split(CharSequence input, int limit)
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Splits the specified input around matches of this pattern The limit determines how many times this pattern will be applied to the input to create the array The number of applications of the pattern is controlled by the limit value passed to the method, as explained in Table 1214 The code below will result in the array shown earlier:
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String input = "tom|dick|harry"; String splitRegex = "\\|"; // regex: \| Pattern splitPattern = Patterncompile(splitRegex); String[] results = splitPatternsplit(input, 4); // { "tom", "dick", "harry" } Table 1214
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Implications of the Limit Value in the split() Method Limit n
n > 0
No of Applications At the most n-1 times, meaning it can also be fewer if the input was exhausted As many times as possible to split the entire input As many times as possible to split the entire input
Array Length No greater than n, meaning it can also be smaller if the input was exhausted Any length required to split the entire input
Other Remarks Any remaining input is returned in the last element of the array
n == 0
Trailing empty strings are discarded
n < 0
Any length required to split the entire input
Trailing empty strings are not discarded
Using the split() method is illustrated in Example 127 The doPatSplits() method at (1) creates a Pattern at (2) and calls the split() method at (3) on this pattern Partial output from Example 127 is shown below Limit value 1 does not split the input, limit value 2 splits the input once, and so on Limit value greater than 3 does not change the results, as the input is exhausted at limit value 3 A non-positive limit value splits the input on the pattern as many times as necessary, until the input is exhausted
Input: tom|dick|harry Split: \| Limit Length Results 3 3 { "tom", "dick", "harry" } 2 2 { "tom", "dick|harry" } 1 1 { "tom|dick|harry" } 0 3 { "tom", "dick", "harry" } -1 3 { "tom", "dick", "harry" }