blocks|key|22045|text|我强烈建议做两件事：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|22046|阅读精通正则表达式的前两章|ordered-list-item|22047|买Regex+Buddy。这是一个小助手程序，它帮助您使用和解释所有令牌和分组选项。它允许您在所使用的文本上测试表达式，还可以生成多种不同语言的代码片段。当我需要regex解决方案时，我开始使用它，它使我快速地提高了学习曲线。现在我不需要它了，但是我仍然使用它来测试一些复杂的名为组匹配的批处理文件解析。Regex+Buddy网站|offset|length|22048|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regexbuddy.com/^0|0|0|48|D|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|S|8|@]|9|@$G|T|H|U|1|V]]|A|$]]|$1|I|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

I highly suggest doing two things:

<ol>
<li>Read the first two chapters of Mastering Regular Expressions</li>
<li>Buy Regex Buddy. It's a little helper program that holds your hand with using and explaining all the tokens and grouping options. It lets you test your expressions on text you're using and also generates code snippets in many different languages. I started using it when I needed regex solutions and it brought me up the learning curve fast. Now I don't need it, but I still use it to test out some complex named group matches I do for batch file parsing. <a href="http://www.regexbuddy.com/" rel="nofollow noreferrer">Regex Buddy Website</a></li>
</ol>

blocks|key|1315314|text|您是在诸如Eclipse或IntelliJ+IDEA这样的IDE中运行应用程序吗？尝试使用命令行代替。有些IDE会把对System.console()的调用搞砸。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1315315|entityMap^0|1N|G|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Are you running the application in an IDE such as Eclipse or IntelliJ IDEA? Try using the command line instead. Some IDEs will screw up calls to <code>System.console()</code>.

blocks|key|1315398|text|一年前我不得不学习RegEx。我使用用于regex的Wikipedia页面和这两个站点在线测试我所需的regex+(Site1，Site2)，而不是使用UltraEdit的regex。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1315399|这并不像你一开始所想的那么困难。|1315400|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Regular_expression|1|http://derekslager.com/blog/posts/2007/09/a-better-dotnet-regular-expression-tester.ashx|2|http://gskinner.com/RegExr/^0|I|J|0|1M|5|1|1S|5|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

I had to learn RegEx one year ago.
I used <a href="http://en.wikipedia.org/wiki/Regular_expression" rel="nofollow noreferrer">Wikipedia page for regex</a> and these these two sites to test online the regex I needed (<a href="http://derekslager.com/blog/posts/2007/09/a-better-dotnet-regular-expression-tester.ashx" rel="nofollow noreferrer">Site1</a>, <a href="http://gskinner.com/RegExr/" rel="nofollow noreferrer">Site2</a>) instead of using regex from UltraEdit...

It is not as difficult as you could think at the beginning

blocks|key|21931|text|是的，萨米尔说的是对的。您可以通过这样做来测试IDE是否支持控制台：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|21932|if+(System.console()+==+null)
{
++++System.out.println("No+console+supported!+:-(");
}+else
{
++++System.out.println("Console+supported!+:-)");
}|code-block|syntax|javascript|21933|您可以阅读关于System.console();+这里的java-doc。|offset|length|style|CODE|21934|您可以看到，如果没有控制台，null将被返回。|21935|回答你的第二个问题|21936|打印某物：|21937|System.out.println("Here+your+text+you+want+to+print");|21938|读一些东西：|21939|Scanner+scanner+=+new+Scanner(System.in);
String+oneWord+=+scanner.next();
String+oneLine+=+scanner.next("\n");|21940|或者：|21941|BufferedReader+br+=+new+BufferedReader(new+InputStreamReader(System.in));
String+line+=+br.readLine();|21942|希望这有帮助，你可以继续学习雷克斯！|21943|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/lang/System.html#console%2528%2529^0|0|0|7|H|P|2|0|0|E|4|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1E|8|@$I|1F|J|1G|K|L]]|9|@$I|1H|J|1I|1|1J]]|A|$]]|$1|M|3|N|5|6|7|1K|8|@$I|1L|J|1M|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1N|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|W|3|X|5|D|7|1R|8|@]|9|@]|A|$E|F]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|D|7|1T|8|@]|9|@]|A|$E|F]]|$1|12|3|13|5|6|7|1U|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

Yes, what Samir said is correct. You can test if your IDE supports the console by doing this:

<pre><code>if (System.console() == null)
{
 System.out.println("No console supported! :-(");
} else
{
 System.out.println("Console supported! :-)");
}
</code></pre>

You can read the java-doc about <code>System.console();</code> <a href="http://java.sun.com/javase/6/docs/api/java/lang/System.html#console%28%29" rel="nofollow noreferrer">here</a>
 There can you see <code>null</code> will be returned if there isn't a console.

<h2>To answer your second question</h2>

To print something:

<pre><code>System.out.println("Here your text you want to print");
</code></pre>

To read something:

<pre><code>Scanner scanner = new Scanner(System.in);
String oneWord = scanner.next();
String oneLine = scanner.next("\n");
</code></pre>

or:

<pre><code>BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = br.readLine();
</code></pre>

Hope this helps, and you can continue learning regexes!

blocks|key|1572219|text|我建议您学习Perl的regex。它比Java集成得好得多|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1572220|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I suggest you to learn regex with Perl. Its much better integrated than with Java

blocks|key|1572244|text|使用本网站：http://www.fileformat.info/tool/regex.htm|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1572245|在内部，它使用java.util.regex包，因此您可以担心学习regex，并且在需要时仍然可以在Java中直接将知识转移到regex。|style|CODE|1572246|entityMap|0|LINK|mutability|MUTABLE|url|http://www.fileformat.info/tool/regex.htm^0|6|15|0|0|7|F|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

Use this website: <a href="http://www.fileformat.info/tool/regex.htm" rel="nofollow noreferrer">http://www.fileformat.info/tool/regex.htm</a>

Internally, it uses the <code>java.util.regex</code> package, so you can worry about learning regex and still have your knowledge directly transfer to regex in Java when you need it.

blocks|key|1315349|text|您可以尝试使用eclipses查找/替换(或使用支持regex的none+ide文本编辑器)的不同类型的正则表达式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315350|Python或Ruby交互式shell是测试regex的好地方(+regex语法比Java好得多)。|1315351|当然还有互联网。|1315352|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You could try different kinds of regular expressions with eclipses find/replace (or with some none ide text editor that supports regex).

Python or Ruby interactive shells are good places to test regex (and regex syntax is much nicer than in Java).

And of course there's the internet.

Hello everyone I'm trying to learn regex from java website and I try to run this JAVA program but each time I get No Console output, what do I do ? here is the url : 

<a href="http://java.sun.com/docs/books/tutorial/essential/regex/test_harness.html" rel="nofollow noreferrer">http://java.sun.com/docs/books/tutorial/essential/regex/test_harness.html</a>

I'm trying this inside eclipse

UPDATE : 

Can anybody suggest some other better way to learn regex

Trying to learn regex

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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大家好，我试着从java网站学习regex，我试着运行这个JAVA程序，但是每次我没有控制台输出时，我该怎么办？这是网址：我正在尝试这个内蚀更新:有人能提出其他更好的方法来学习regex吗？

问尝试学习regex
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