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Рассказ про Болгарскую Этнографию

Read my new article about backlinks.

Try the new Backlinks Checker to check validity of backlinks to your site, and updated Meta Keywords SEO tool to generate good keywords based on content of your page.

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Pattern Matching

First look at the normal code with + greedy quantifier. In this example we try to find sequences containing at least one a character. Hence our pattern is a+

  Pattern p = Pattern.compile("a+");
  Matcher m = p.matcher("ab4 5aaaa6_7ab");
  System.out.println("Pattern is " + m.pattern());
  while(m.find()) {
    System.out.println(m.start() + " " + m.group());
  }

We'll get quite expectable output

 Pattern is a+
 0 a
 5 aaaa
 12 a

+ sign is a greedy quantifier, therefore we got all a symbols starting from 5th position in one group. Now let's change + to * greedy quantifier in our pattern and execute the same code with a* pattern.

 0 a
 1
 2
 3
 4
 5 aaaa
 9
 10
 11
 12 a
 13
 14

As you see, we got a strange result. Do you have any idea about this result? I'll try to explain. Because of the nature of * quantifier, matcher looks for zero or more occurrences of the a character. That's why it gives every position in result, even after last character.

We'll have the similar result with ? quantifier. Only the line 5 will be spanned to 4 lines with a single a in each line.

Author: Jafar N.Aliyev (Jsoft)

more Java articles >>

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Use site WITH WWW or WITHOUT WWW prefix

Many sites use url with and without www. Although it doesn't matter how to call the site in point of user view. But for analytics, website statistics and page ranking point of view it'll better to always use one version and redirect others to this version. Some sites redirect all userts to www version of site, others use the url without www and redirects all requests made against www to the version without www.

Redirect users to access the site WITHOUT WWW

To redirect all users to access the site WITHOUT WWW. prefix, (http://www.example.com/... will be redirected to http://example.com/...)write the following instruction in .htaccess

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://example.com/$1 [L,R=301]

Redirect users to access the site WITH WWW

To redirect all users to access the site WITH WWW. prefix, (http://example.com/... will be redirected to http://www.example.com/...)write the following instruction in .htaccess

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

Author: Jafar N.Aliyev (Jsoft)

more HTML articles >>

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Fixing overflow: hidden in IE

Although you specify overflow:hidden IE doesn't wrap words in block model when contents overflow. Mozilla and Opera just hide the part of word if can't break it. Fortunately CSS3 has two properties to manage it.

word-wrap: break-word;
word-break: keep-all;

First of them instructs the browser to wrap words. The second says how to wrap them. In this example word-break: keep-all says that try to keep words if possible. If we write word-break: break-all the browser will break all words anywhere.

Author: Jafar N.Aliyev (Jsoft)

more CSS articles >>

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