Catch PatternSyntaxException and get information from it - Java Regular Expressions

Java examples for Regular Expressions:Pattern

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Description

Catch PatternSyntaxException and get information from it

Demo Code

import java.io.Console;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.regex.PatternSyntaxException;

public class RegexTestHarness2 {

    public static void main(String[] args) {
        Pattern pattern = null;//from w w w  .  ja v  a  2s. co m
        Matcher matcher = null;

        Console console = System.console();
        if (console == null) {
            System.err.println("No console.");
            System.exit(1);
        }
        while (true) {
            try {
                pattern = Pattern.compile(console
                        .readLine("%nEnter your regex: "));

                matcher = pattern.matcher(console
                        .readLine("Enter input string to search: "));
            } catch (PatternSyntaxException pse) {
                console.format("There is a problem"
                        + " with the regular expression!%n");
                console.format("The pattern in question is: %s%n",
                        pse.getPattern());
                console.format("The description is: %s%n",
                        pse.getDescription());
                console.format("The message is: %s%n", pse.getMessage());
                console.format("The index is: %s%n", pse.getIndex());
                System.exit(0);
            }
            boolean found = false;
            while (matcher.find()) {
                console.format("I found the text" + " \"%s\" starting at "
                        + "index %d and ending at index %d.%n",
                        matcher.group(), matcher.start(), matcher.end());
                found = true;
            }
            if (!found) {
                console.format("No match found.%n");
            }
        }
    }
}

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 *     from this software without specific prior written permission.
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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Result


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