RegEx in Java. \b does not react to a newline Post: 302421243

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Top Forums Programming RegEx in Java. \b does not react to a newline Post 302421243 by durden_tyler on Friday 14th of May 2010 12:35:40 AM

05-14-2010

Registered User

Works fine for me:

Code:

$ 
$ 
$ # show the Java program
$ cat -n RegexTest.java
     1    import java.util.regex.Matcher;
     2    import java.util.regex.Pattern;
     3    public class RegexTest {
     4      public static void main(String[] args) {
     5        String str = "hello and bye\nand\nblah";
     6        String ptn = "\\b\\w+\\b";
     7        int num = 0;
     8        Pattern pattern = Pattern.compile(ptn);
     9        Matcher matcher = pattern.matcher(str);
    10        System.out.println("=======  String for inspection  =======");
    11        System.out.println(str);
    12        System.out.println("========================================");
    13        System.out.println("=======  Pattern to be searched  =======");
    14        System.out.println(ptn);
    15        System.out.println("========================================");
    16        boolean found = false;
    17        while (matcher.find()) {
    18          num++;
    19          System.out.println("Match # "+num+"\t:\t"+matcher.group()+"\t=>\tstarts at "
    20              + "index "+matcher.start()+" and ends at index "+matcher.end());
    21          found = true;
    22        }
    23        if (!found) {
    24          System.out.println("No match found");
    25        }
    26      }
    27    }
$ 
$ # compile
$ javac RegexTest.java
$ 
$ # run
$ java RegexTest
=======  String for inspection  =======
hello and bye
and
blah
========================================
=======  Pattern to be searched  =======
\b\w+\b
========================================
Match # 1    :    hello    =>    starts at index 0 and ends at index 5
Match # 2    :    and    =>    starts at index 6 and ends at index 9
Match # 3    :    bye    =>    starts at index 10 and ends at index 13
Match # 4    :    and    =>    starts at index 14 and ends at index 17
Match # 5    :    blah    =>    starts at index 18 and ends at index 22
$ 
$

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LEARN ABOUT LINUX

dacs.java

DACS.JAVA(7)						  DACS Miscellaneous Information					      DACS.JAVA(7)

NAME

       dacs.java - DACS Java support

DESCRIPTION

       This document describes support for Java provided by DACS.

       To enable Java support, DACS must be configured using the --enable-java flag. It may also be necessary to specify the location of the Java
       commands and include files. See dacs.install(7)[1].

	   Note
	   Java support is currently very limited and should be considered experimental. It is currently only possible to call dacsauth(1)[2] and
	   dacscheck(1)[3] using the Java Native Interface (JNI) provided. The command line arguments to both of these commands are exactly as
	   documented in their manual pages. Each argument is passed as a String.

	   The code is not thread-safe and is probably not suitable for being called many times within a particular process due to assumptions it
	   makes about dynamic memory allocation.

	   There are no immediate plans to improve or extend Java support. Using the existing capability to build the JNI layer, however, it
	   should not be difficult for an experienced Java programmer to build upon the example Java code provided.

       With Java support enabled, building DACS will copy the JNI shared library and a .jar file to the library directory (default:
       /usr/local/dacs/lib), and the JNI include files to the include directory (default: /usr/local/dacs/include).

       The tools/java/jni distribution directory contains a simple script called javarun that demonstrates how to run dacsauth or dacscheck as a
       Java application. For example, to validate the Unix password for user somebody, run (as root):

	   ./javarun dacsauth -m unix suff -user somebody -prompt

DIAGNOSTICS

       The return codes are as documented in the command's manual page.

AUTHOR

       Distributed Systems Software (www.dss.ca[4])

COPYING

       Copyright2003-2012 Distributed Systems Software. See the LICENSE[5] file that accompanies the distribution for licensing information.

NOTES

	1. dacs.install(7)
	   http://dacs.dss.ca/man/dacs.install.7.html

	2. dacsauth(1)
	   http://dacs.dss.ca/man/dacsauth.1.html

	3. dacscheck(1)
	   http://dacs.dss.ca/man/dacscheck.1.html

	4. www.dss.ca
	   http://www.dss.ca

	5. LICENSE
	   http://dacs.dss.ca/man/../misc/LICENSE

DACS 1.4.27b							    10/22/2012							      DACS.JAVA(7)