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54  * Portions of this software are based upon software originally written
55  * by Daniel F. Savarese. We appreciate his contributions.
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57
58 import org.apache.oro.text.regex.*;
59
60 /**
61  * This is a test program demonstrating the methods of the OROMatcher
62  * MatchResult class.
63  *
64  @author <a HREF="dfs@savarese.org">Daniel F. Savarese</a>
65  @version $Id: matchResultExample.java,v 1.1.1.1 2000/07/23 23:08:48 jon Exp $
66  */
67 public final class matchResultExample {
68
69   /**
70    * Takes a regular expression and string as input and reports all the
71    * pattern matches in the string.
72    * <p>
73    * @param args[] The array of arguments to the program. The first
74    * argument should be a Perl5 regular expression, and the second
75    * should be an input string.
76    */
77   public static final void main(String JavaDoc args[]) {
78     int groups;
79     PatternMatcher matcher;
80     PatternCompiler compiler;
81     Pattern pattern = null;
82     PatternMatcherInput input;
83     MatchResult result;
84
85     // Must have at least two arguments, else exit.
86 if(args.length < 2) {
87       System.err.println("Usage: matchResult pattern input");
88       return;
89     }
90
91     // Create Perl5Compiler and Perl5Matcher instances.
92 compiler = new Perl5Compiler();
93     matcher = new Perl5Matcher();
94
95     // Attempt to compile the pattern. If the pattern is not valid,
96 // report the error and exit.
97 try {
98       pattern = compiler.compile(args[0]);
99     } catch(MalformedPatternException e) {
100       System.err.println("Bad pattern.");
101       System.err.println(e.getMessage());
102       return;
103     }
104
105     // Create a PatternMatcherInput instance to keep track of the position
106 // where the last match finished, so that the next match search will
107 // start from there. You always create a PatternMatcherInput instance
108 // when you want to search a string for all of the matches it contains,
109 // and not just the first one.
110 input = new PatternMatcherInput(args[1]);
111
112
113     // Loop until there are no more matches left.
114 while(matcher.contains(input, pattern)) {
115       // Since we're still in the loop, fetch match that was found.
116 result = matcher.getMatch();
117
118       // Perform whatever processing on the result you want.
119 // Here we just print out all its elements to show how the
120 // MatchResult methods are used.
121
122       // The toString() method is provided as a convenience method.
123 // It returns the entire match. The following are all equivalent:
124 // System.out.println("Match: " + result);
125 // System.out.println("Match: " + result.toString());
126 // System.out.println("Match: " + result.group(0));
127 System.out.println("Match: " + result.toString());
128
129       // Print the length of the match. The length() method is another
130 // convenience method. The lengths of subgroups can be obtained
131 // by first retrieving the subgroup and then calling the string's
132 // length() method.
133 System.out.println("Length: " + result.length());
134
135       // Retrieve the number of matched groups. A group corresponds to
136 // a parenthesized set in a pattern.
137 groups = result.groups();
138       System.out.println("Groups: " + groups);
139
140       // Print the offset into the input of the beginning and end of the
141 // match. The beinOffset() and endOffset() methods return the
142 // offsets of a group relative to the beginning of the input. The
143 // begin() and end() methods return the offsets of a group relative
144 // the to the beginning of a match.
145 System.out.println("Begin offset: " + result.beginOffset(0));
146       System.out.println("End offset: " + result.endOffset(0));
147       System.out.println("Groups: ");
148
149       // Print the contents of each matched subgroup along with their
150 // offsets relative to the beginning of the entire match.
151
152       // Start at 1 because we just printed out group 0
153 for(int group = 1; group < groups; group++) {
154     System.out.println(group + ": " + result.group(group));
155     System.out.println("Begin: " + result.begin(group));
156     System.out.println("End: " + result.end(group));
157       }
158     }
159   }
160 }
161
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