Example usage for java.util.regex PatternSyntaxException getMessage

Introduction

In this page you can find the example usage for java.util.regex PatternSyntaxException getMessage.

Prototype

public String getMessage()

Source Link

Document

Returns a multi-line string containing the description of the syntax error and its index, the erroneous regular-expression pattern, and a visual indication of the error index within the pattern.

Usage

From source file:sorcer.core.provider.logger.RemoteLoggerManager.java

public String getLogComments(String filename) {
    Pattern p = null;//from  ww w.j av a 2 s .  com
    try {
        // The following pattern lets this extract multiline comments that
        // appear on a single line (e.g., /* same line */) and single-line
        // comments (e.g., // some line). Furthermore, the comment may
        // appear anywhere on the line.
        p = Pattern.compile(".*/\\*.*\\*/|.*//.*$");
    } catch (PatternSyntaxException e) {
        System.err.println("Regex syntax error: " + e.getMessage());
        System.err.println("Error description: " + e.getDescription());
        System.err.println("Error index: " + e.getIndex());
        System.err.println("Erroneous pattern: " + e.getPattern());
    }
    BufferedReader br = null;
    StringBuffer bw = new StringBuffer();
    try {
        FileReader fr = new FileReader(filename);
        br = new BufferedReader(fr);
        Matcher m = p.matcher("");
        String line;
        while ((line = br.readLine()) != null) {
            m.reset(line);
            if (m.matches()) /* entire line must match */
            {
                bw.append(line + "\n");
            }
        }
    } catch (IOException e) {
        System.err.println(e.getMessage());
    } finally // Close file.
    {
        try {
            if (br != null)
                br.close();
        } catch (IOException e) {
        }
    }
    return bw.toString();
}