Re: help using pattern and matcher classes

From:

IchBin <weconsul@ptd.net>

Newsgroups:

comp.lang.java.help

Date:

Mon, 19 Jun 2006 15:22:35 -0400

Message-ID:

<T9ycnYJvrvPnZAvZUSdV9g@ptd.net>

IchBin wrote:

Petterson Mikael wrote:

Hi,

I have two words that I need to search my files for.

DONUMBER and DO_NUMBER.

I am not sure how I can create two patterns to search for in the same
file. Also what is the difference between the pattern and matcher
(since you can use regex in both).

This is the code I will use:

try {
            // Create the reader
            String filename = "infile.txt";
            String patternStr1 = "DONUMBER";
            String patternStr2 = "DO_NUMBER";
            BufferedReader rd = new BufferedReader(new
FileReader(filename));
                // Create the pattern

            Pattern pattern1 = Pattern.compile(patternStr1);
            Pattern pattern2 = Pattern.compile(patternStr2);
            Matcher matcher1 = pattern1.matcher("");
            Matcher matcher2 = pattern2.matcher("");

            // Retrieve all lines that match pattern
            String line = null;
            while ((line = rd.readLine()) != null)
            {
                matcher2.reset(line);
                matcher1.reset(line);
                if (matcher2.find() || matcher1.find())

                    // line matches the pattern
                }
            }
        } catch (IOException e) {
        }

Also take a look at this "Implementing a FilterReader to Filter Lines
Based on a Regular Expression" in the The Java Developers Almanac

http://javaalmanac.com/egs/java.util.regex/LineFilter2.html

Thanks in Advance...
IchBin, Pocono Lake, Pa, USA
http://weconsultants.servebeer.com/JHackerAppManager
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