corejava第8版

corejava第8版/v2ch01/RegExTest/RegExTest.java

@@ -0,0 +1,60 @@
+import java.util.*;
+import java.util.regex.*;
+
+/**
+   This program tests regular expression matching.
+   Enter a pattern and strings to match, or hit Cancel
+   to exit. If the pattern contains groups, the group
+   boundaries are displayed in the match.
+   @version 1.01 2004-05-11
+   @author Cay Horstmann
+*/
+public class RegExTest
+{
+   public static void main(String[] args)
+   {
+      Scanner in = new Scanner(System.in);
+      System.out.println("Enter pattern: ");
+      String patternString = in.nextLine();
+
+      Pattern pattern = null;
+      try
+      {
+         pattern = Pattern.compile(patternString);
+      }
+      catch (PatternSyntaxException e)
+      {
+         System.out.println("Pattern syntax error");
+         System.exit(1);
+      }
+
+      while (true)
+      {
+         System.out.println("Enter string to match: ");
+         String input = in.nextLine();        
+         if (input == null || input.equals("")) return;
+         Matcher matcher = pattern.matcher(input);
+         if (matcher.matches())
+         {
+            System.out.println("Match");
+            int g = matcher.groupCount();
+            if (g > 0)
+            {
+               for (int i = 0; i < input.length(); i++)
+               {
+                  for (int j = 1; j <= g; j++)
+                     if (i == matcher.start(j)) 
+                        System.out.print('(');
+                  System.out.print(input.charAt(i));
+                  for (int j = 1; j <= g; j++)
+                     if (i + 1 == matcher.end(j)) 
+                        System.out.print(')');
+               }
+               System.out.println();
+            }
+         }
+         else
+            System.out.println("No match");
+      }
+   }
+}