Java by API/java.util.regex/Pattern

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Pattern.CANON_EQ

   <source lang="java">

/* égal matches input égal égal matches input e?gal égal does not match input e?gal égal does not match input e"gal égal does not match input e�gal

* */

import java.util.regex.Pattern; /**

* CanonEqDemo - show use of Pattern.CANON_EQ, by comparing varous ways of
* entering the Spanish word for "equal" and see if they are considered equal by
* the RE-matching engine.
* 
* @version $Id: CanonEqDemo.java,v 1.3 2004/03/21 20:06:20 ian Exp $
*/

public class MainClass {

 public static void main(String[] args) {
   String pattStr = "\u00e9gal"; // �gal
   String[] input = { "\u00e9gal", // �gal - this one had better match :-)
       "e\u0301gal", // e + "Combining acute accent"
       "e\u02cagal", // e + "modifier letter acute accent"
       "e"gal", // e + single quote
       "e\u00b4gal", // e + Latin-1 "acute"
   };
   Pattern pattern = Pattern.rupile(pattStr, Pattern.CANON_EQ);
   for (int i = 0; i < input.length; i++) {
     if (pattern.matcher(input[i]).matches()) {
       System.out.println(pattStr + " matches input " + input[i]);
     } else {
       System.out.println(pattStr + " does not match input " + input[i]);
     }
   }
 }

}

      </source>
   
  
 
  



Pattern.CASE_INSENSITIVE

   <source lang="java">

/* IGNORE_CASE match true MATCH_NORMAL match was false

  • /

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String[] argv) {
   String pattern = "^q[^u]\\d+\\.";
   String input = "QA777. is the next flight.";
   Pattern reCaseInsens = Pattern.rupile(pattern, Pattern.CASE_INSENSITIVE);
   Pattern reCaseSens = Pattern.rupile(pattern);
   boolean found;
   Matcher m;
   m = reCaseInsens.matcher(input); // will match any case
   found = m.lookingAt();           // will match any case
   System.out.println("IGNORE_CASE match " + found);
   m = reCaseSens.matcher(input); // Get matcher w/o case-insens flag
   found = m.lookingAt();         // will match case-sensitively
   System.out.println("MATCH_NORMAL match was " + found);
 }

}

      </source>
   
  
 
  



Pattern: compile("[a-z]+")

   <source lang="java">

/*

* Output:

Match: www Match: java Match: s Match: com

* */

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String args[]) {
   // Match lowercase words.
   Pattern pat = Pattern.rupile("[a-z]+");
   Matcher mat = pat.matcher("www.jexp.ru.");
   while (mat.find())
     System.out.println("Match: " + mat.group());
 }

}

      </source>
   
  
 
  



Pattern: compile("d.*ian")

   <source lang="java">

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String[] args) {
   Pattern myRE = Pattern.rupile("d.*ian");
   Matcher matcher = myRE.matcher("danian devonian dan");
   matcher.lookingAt();
   String result = matcher.group(0);
   System.out.println(result);
 }

}

      </source>
   
  
 
  



Pattern: compile("e.+?d")

   <source lang="java">

/*

* Output:

Match: extend Match: end

* */

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String args[]) {
   Pattern pat = Pattern.rupile("e.+?d");
   Matcher mat = pat.matcher("extend cup end table");
   while (mat.find())
     System.out.println("Match: " + mat.group());
 }

}

      </source>
   
  
 
  



Pattern: compile(String text)

   <source lang="java">

/*

* Output:

Matches No Match

* */

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String args[]) {
   Pattern pat;
   Matcher mat;
   boolean found;
   pat = Pattern.rupile("Java");
   mat = pat.matcher("Java");
   found = mat.matches();
   if (found)
     System.out.println("Matches");
   else
     System.out.println("No Match");
   System.out.println();
   mat = pat.matcher("Java 2");
   found = mat.matches();
   if (found)
     System.out.println("Matches");
   else
     System.out.println("No Match");
 }

}

      </source>
   
  
 
  



Pattern: compile("(\\w+)\\s(\\d+)")

   <source lang="java">

import java.util.regex.*; public class MainClass {

 public static void main(String[] args) {
   Pattern patt = Pattern.rupile("(\\w+)\\s(\\d+)"); 
   Matcher matcher = patt.matcher("Bananas 123"); 
   matcher.lookingAt();
   System.out.println("Name: " + matcher.group(1)); 
   System.out.println("Number: " + matcher.group(2)); 
 }

}

      </source>
   
  
 
  



Pattern: matcher(String text)

   <source lang="java">

/*

* Output:

Matches No Match

* */

import java.util.regex.Matcher; import java.util.regex.Pattern; public class MainClass {

 public static void main(String args[]) {
   Pattern pat;
   Matcher mat;
   boolean found;
   pat = Pattern.rupile("Java");
   mat = pat.matcher("Java");
   found = mat.matches();
   if (found)
     System.out.println("Matches");
   else
     System.out.println("No Match");
   System.out.println();
   mat = pat.matcher("Java 2");
   found = mat.matches();
   if (found)
     System.out.println("Matches");
   else
     System.out.println("No Match");
 }

}

      </source>
   
  
 
  



Pattern: split(String str)

   <source lang="java">

/*

* Output:

Next token: www Next token: jexp Next token: com Next token: java Next token: javascript Next token: API Next token: example

* */

import java.util.regex.Pattern; public class MainClass {

 public static void main(String args[]) {
   Pattern pat = Pattern.rupile("[ ,.!]");
   String strs[] = pat.split("www.jexp.ru java javascript API example.");
   for (int i = 0; i < strs.length; i++)
     System.out.println("Next token: " + strs[i]);
 }

}

      </source>