126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS in Java

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126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS
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matchMaker("[Hh]o", "Who is who Whose is it To whom it may concern How are you "); matchMaker("\\d\\d-\\d\\d-\\d\\d", "01-03-49 786 09-09-09"); matchMaker("\\ $", "Who is who Who me Who else "); matchMaker("([Jj][aA][vV][aA])|([Cc]\\+\\+)", "JaVA jAvA C++ jAv c+++1 javan C+"); matchMaker("a ", "banana"); matchMaker("\\d\\d -\\d\\d -\\d\\d ", "01-3-49 23-12 9-09-09 01-01-2010"); matchMaker("a*", "baananaa"); matchMaker("(0|[1-9]\\d*)\\\\d\\d", "50 150 050 1050 0050 1555"); matchMaker("a+", "baananaa"); matchMaker("\\d+\\\\d+", "50 150 0 1050 0050 1555"); matchMaker("<+>", "My <>very<> <emphasis>greedy</emphasis> regex"); matchMaker("<+ >", "My <>very<> <emphasis>reluctant</emphasis> regex"); matchMaker("<[^>]+>", "My <>very<> <emphasis>powerful</emphasis> regex"); // Some more regular expression examples matchMaker("(^[a-z])|(\\ $)", "who is who Who me Who else "); matchMaker("[\\\\-^$ *+()|]", "\\-^$ *+()|"); matchMaker("[-+] [0-9]+", "+123 -34 567 23435"); matchMaker("[a-zA-Z][a-zA-Z0-9]+", "+a123 -X34 567 m23mm435"); matchMaker("[^,]+", "+a123, -X34, 567, m2,3mm435"); matchMaker("\\\\", "book\\\\chapter\\section\\"); matchMaker("[^\\\\]+", "book\\\\chapter\\section\\"); } public static void matchMaker(String regexStr, String target) { // Systemoutprint("Index: "); for (int i = 0; i < targetlength(); i++) { Systemoutprint(i%10); } Systemoutprintln(); Systemoutprintln("Target: " + target); Systemoutprintln("Pattern: " + regexStr); Systemoutprint( "Match: "); Pattern pattern = Patterncompile(regexStr); // Matcher matcher = patternmatcher(target); // while(matcherfind()) { // int startCharIndex = matcherstart(); // int lastPlus1Index = matcherend(); // int lastCharIndex = startCharIndex == lastPlus1Index lastPlus1Index : lastPlus1Index-1; String matchedStr = matchergroup(); // Systemoutprint("(" + startCharIndex + "," + lastCharIndex + ":" + matchedStr + ")"); } Systemoutprintln(); } } (1)
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Output from the program:
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Index: Target: Pattern: Match: 0123456789012345678901 book\\chapter\section\ [^\\]+ (0,3:book)(6,12:chapter)(14,20:section)
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CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING
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Match-and-Replace Mode
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In this mode, the matcher allows the matched characters in the input to be replaced with new ones Details of the methods used for this purpose are given below The find() and the appendReplacement() methods comprise the match-andreplace loop, with the appendReplacement() method completing the operation when the loop finishes Note that these methods use a StringBuffer, and have not been updated to work with a StringBuilder
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Matcher appendReplacement(StringBuffer sb, String replacement)
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Implements a non-terminal append-and-replace step, ie, it successively adds the non-matched characters in the input, followed by the replacement of the match, to the string buffer The find() method and the appendReplacement() method are used in lockstep to successively replace all matches, and the appendTail() method is called as the last step to complete the match-and-replace operation
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StringBuffer appendTail(StringBuffer sb)
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Implements a terminal append-and-replace step, ie, it copies the remaining characters from the input to the string buffer, which is then returned It should be called after appendReplacement() operations have completed
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String replaceAll(String replacement)
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Replaces every subsequence of the input that matches the pattern with the specified replacement string The method resets the matcher first and returns the result after the replacement
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String replaceFirst(String replacement)
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Replaces the first subsequence of the input that matches the pattern with the specified replacement string The method resets the matcher first and returns the result after the replacement Example 129 illustrates the match-and-replace loop Non-matching characters in the input and the replacements of the matches are successively added to the string buffer in the loop at (1), with the call to the appendTail() method at (3) completing the operation The same operation is repeated using the replaceAll() method at (4) Using the replaceAll() method replaces all matches with the same replacement, but the match-and-replace loop offers greater flexibility in this regard, as each replacement can be tailored when a match is found
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126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS
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Example 129 Match and Replace import javautilregexMatcher; import javautilregexPattern; public class MatchAndReplace { public static void main(String[] args) { // Match and replace loop: Pattern pattern = Patterncompile("be"); String input = "What will be will be"; Systemoutprintln(input); Matcher matcher = patternmatcher(input); StringBuffer strBuf = new StringBuffer(); while (matcherfind()) { matcherappendReplacement(strBuf, "happen"); } matcherappendTail(strBuf); Systemoutprintln(strBuf); // Match and replace all: matcherreset(); String result = matcherreplaceAll("happen"); Systemoutprintln(result); } }
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Output from the program: