The dot cannot be used inside character classes.

See the option [Pattern.DOTALL][1].

&gt; `Pattern.DOTALL` Enables dotall mode. In dotall mode, the expression `.` matches any character, including a line terminator. By default this expression does not match line terminators. Dotall mode can also be enabled via the embedded flag expression `(?s)`. (The s is a mnemonic for &quot;single-line&quot; mode, which is what this is called in Perl.)

If you need it on just a portion of the regular expression, you use e.g. `[\s\S]`.

  [1]: http://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html#DOTALL

Edit: While my original answer is technically correct, as ThorSummoner pointed out, it can be done more efficiently like so

`[\s\S]`
----------

as compared to `(.|\n)` or `(.|\n|\r)`

Hints:  
`\s`:  any **whitespace character**  
like (space/newLine/...)  

`\S`:  any **non-whitespace character**  
like (characters /sepcial characters/ numbers / ...)


Try this

```
((.|\n)*)
``` 

It matches all characters multiple times

Is there a way ( I mean how do I ) set a system property in a maven project?


I want to access a property from my test and my webapp ( running locally ) and I know I can use a java system property. 


Should I put that in ./settings.xml or something like that?

&lt;b&gt;Context&lt;/b&gt;

I took an open source project and managed to change the db configuration to use JavaDB


Now, in the jdbc url for JavaDB, the location of the database could be specified as the full path ( see: [this other question][1] ) 

Or a system property: `derby.system.home`

I have the code working already, but currently it is all hardcoded to: 


     jdbc:derby:/Users/oscarreyes/javadbs/mydb

And I want to remove the full path, to leave it like:

     jdbc:derby:mydb

To do that I need to specify the system property ( `derby.system.home` ) to maven, but I don&#39;t know how. 

The test are performed using junit ( I don&#39;t see any plugin in pom.xml ) and the web app runs with the jetty plugin. 


Specifying the system property in the command line seems to work for jetty, but I&#39;m not sure if that&#39;s something practical ( granted some other users may run it from eclipse/idea/ whatever ) 


  [1]: https://stackoverflow.com/questions/3231614/javadb-derby-path-to-database

Specify system property to Maven project

If an array is empty, it looks like you can&#39;t check it&#39;s length using &quot;.length&quot;.  What&#39;s the best way to check if an array is empty?

If (Array.Length == 0)

I thought it may be `[.\n]+` but that doesn&#39;t seem to work?



Any character including newline - Java Regex

<p>I thought it may be <code>[.\n]+</code> but that doesn't seem to work?</p>


A little while ago, I saw a question answered here regarding the fine-grained organization of java packages.  For example, `my.project.util`, `my.project.factory`, `my.project.service`, etc.

I can&#39;t find it now, so I may as well ask the question.

Are there best practices with regards to the organization of packages in Java and what goes in them?

How do you organize your classes in your Java project?  

For instance, a project I&#39;m working on with a few people has a package called beans. It started out being a project containing simple beans, but has ended up (through poor experience and lack of time) containing everything (almost).  I&#39;ve cleaned them up a little, by putting some factory classes in a factory package (classes with static methods that create beans) but we have other classes that do business logic and others that do simple processing (not with business logic) like retrieving a message for a code from a properties file.

Your thoughts and comments are appreciated.

Are there best practices for (Java) package organization?

If I have an enum object, is it considered a primitive or a reference?

Are Java enums considered primitive or reference types?

How can I make an equality assertion between lists in a ***JUnit*** test case? Equality should be between the content of the list.

For example:

    List&lt;String&gt; numbers = Arrays.asList(&quot;one&quot;, &quot;two&quot;, &quot;three&quot;);
	List&lt;String&gt; numbers2 = Arrays.asList(&quot;one&quot;, &quot;two&quot;, &quot;three&quot;);
	List&lt;String&gt; numbers3 = Arrays.asList(&quot;one&quot;, &quot;two&quot;, &quot;four&quot;); 
    
    // numbers should be equal to numbers2
    //numbers should not be equal to numbers3

Assert equals between 2 Lists in Junit

I need a comparator as part of a strategy pattern that can either use the natural ordering of the objects or some custom ordering. For the natural ordering case, I wrote a simple comparator:

    private static class NaturalComparator&lt;T extends Comparable&lt;? super T&gt;&gt; implements Comparator&lt;T&gt; {
        @Override
        public int compare(T o1, T o2) {
            return o1.compareTo(o2);
        }
    }

Seems simple enough, but I was wondering if anyone knew of one in the standard API. I looked at TreeMap, and it does it without such a class, so when that code was written, the apparent answer would be no, but perhaps it was added later.

Does a natural comparator exist in the standard api?

I&#39;m pretty new to Java and am following the [Eclipse Total Beginner&#39;s Tutorials][1]. They are all very helpful, but in Lesson 12, he uses `assertTrue` for one test case and `assertFalse` for another. Here&#39;s the code:

    // Check the book out to p1 (Thomas)
    // Check to see that the book was successfully checked out to p1 (Thomas)
    assertTrue(&quot;Book did not check out correctly&quot;, ml.checkOut(b1, p1));	// If checkOut fails, display message
    assertEquals(&quot;Thomas&quot;, b1.getPerson().getName());
		
    assertFalse(&quot;Book was already checked out&quot;, ml.checkOut(b1,p2));		// If checkOut fails, display message
    assertEquals(&quot;Book was already checked out&quot;, m1.checkOut(b1,p2));

I have searched for good documentation on these methods, but haven&#39;t found anything. If my understanding is correct, `assertTrue` as well as `assertFalse` display the string when the second parameter evaluates to false. If so, what is the point of having both of them?

Edit: I think I see what was confusing me. The author may have put both of them in just to show their functionality (it IS a tutorial after all). And he set up one which would fail, so that the message would print out and tell me WHY it failed. Starting to make more sense...I think that&#39;s the explanation, but I&#39;m not sure. 

  [1]: http://eclipsetutorial.sourceforge.net/totalbeginner.html

Java/ JUnit - AssertTrue vs AssertFalse

I am wondering if there is a better to represent a fix amount of repeats in a regular expression. For example, if I just want to match exactly 14 letters/digits, I am using `^\w\w\w\w\w\w\w\w\w\w\w\w\w\w$` which will match a word like `UNL075BE499135` and not match `UNL075BE499135AAA`
is there a handy way to do it? In am currently doing it in java but I guess this may apply to other language as well. Thanks in advance.


How to represent a fix number of repeats in regular expression?

Is it possible in `JavaScript` to do something like `preg_match` does in `PHP` ?

I would like to be able to get two numbers from string:

    var text = &#39;price[5][68]&#39;;

into two separated variables:

    var productId = 5;
    var shopId    = 68;

Edit:
I also use `MooTools` if it would help.


preg_match in JavaScript?

&gt; **Possible Duplicate:**  
&gt; [How to determine if a number is a prime with regex?](https://stackoverflow.com/questions/2795065/how-to-determine-if-a-number-is-a-prime-with-regex)  

&lt;!-- End of automatically inserted text --&gt;

&lt;a href=&quot;http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/&quot;&gt;This page&lt;/a&gt; claims that this regular expression discovers non-prime numbers (and by counter-example: primes):

    /^1?$|^(11+?)\1+$/

How does this find primes?

How does this regex find primes?

I&#39;m completely incapable of regular expressions, and so I need some help with a problem that I think would best be solved by using regular expressions.

I have list of strings in C#:

    List&lt;string&gt; lstNames = new List&lt;string&gt;();
    lstNames.add(&quot;TRA-94:23&quot;);
    lstNames.add(&quot;TRA-42:101&quot;);
    lstNames.add(&quot;TRA-109:AD&quot;);
    
    foreach (string n in lstNames) {
      // logic goes here that somehow uses regex to remove all special characters
      string regExp = &quot;NO_IDEA&quot;;
      string tmp = Regex.Replace(n, regExp, &quot;&quot;);
    }

I need to be able to loop over the list and return each item without any special characters. For example, item one would be &quot;TRA9423&quot;, item two would be &quot;TRA42101&quot; and item three would be TRA109AD. 

Is there a regular expression that can accomplish this for me?

Also, the list contains more than 4000 items, so I need the search and replace to be efficient and quick if possible.

EDIT:
I should have specified that any character beside a-z, A-Z and 0-9 is special in my circumstance.

Regex to remove all special characters from string?

I am in shell and I have this string: `12 BBQ ,45 rofl, 89 lol`

Using the regexp: `\d+ (?=rofl)`, I want `45` as a result.

Is it correct to use regex to extract data from a string? The best I have done is to highlight the value in some of the online regex editor. Most of the time it remove the value from my string.

I am investigating `expr`, but all I get is syntax errors.
 
How can I manage to extract 45 in a shell script?

Content Type	Original Author	Original Content on Stackoverflow
Question	Mick	View Question on Stackoverflow
Solution 1 - Java	Artefacto	View Answer on Stackoverflow
Solution 2 - Java	Jason L.	View Answer on Stackoverflow
Solution 3 - Java	Youngkhaf	View Answer on Stackoverflow

Any character including newline - Java Regex

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

`[\s\S]`

Solution 3 - Java

If (Array.Length == 0)

Specify system property to Maven project

Attributions