Questions about PHP information retrieval

Questions about PHP Information Retrieval & lt ;? Php & nbsp; $ baiduwww. baidu. coms? Wdsite % 3Ahao123.com; & nbsp; $ sitefile_get_contents ($ baidu); & nbsp; $ site & nbsp; iconv (UTF-8, GB2312 questions about PHP obtaining information

 $ Baidu = "http://www.baidu.com/s? Wd = site % 3Ahao123.com ";
$ Site = file_get_contents ($ baidu );
$ Site = iconv ("UTF-8", "GB2312", $ site );
Ereg ("(.*)", $ Site, $ count );
Print_r ($ count); // Obtain the number of topics indexed in Baidu

?>

Result: Array ([0] => [1] => Baidu search _ site: hao123.com)
However:

 $ Baidu = "http://www.baidu.com/s? Wd = site % 3Ahao123.com ";
$ Site = file_get_contents ($ baidu );
$ Site = iconv ("UTF-8", "GB2312", $ site );
Ereg ("(.*)", $ Site, $ count );
Print_r ($ count); // Obtain the number of topics indexed in Baidu

?>

This won't work...
Please explain how to get Baidu's indexing ....
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Preg_match ('%Find the number of related results (.*?) .% I ', $ site, $ count );

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The "." in the regular expression matches any character except "\ n" and cannot match Chinese characters.
Preg_match ('%Find the number of related results (.*?) .% I ', $ site, $ count );
Same as the following:
Preg_match ('/Find the number of related results (.*?) ./I ', $ site, $ count );

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Reference:

PHP code? 12preg_match ('% Find the number of related results (.*?) .% I ', $ site, $ count );

In fact

Preg_match ('/Find the number of related results. <\/Strong>/I ', $ site, $ count );

You can.
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%Find the number of related results (.*?) .The key to % I is that the last "I" indicates that case sensitivity is ignored. if "I" is not added, "%" is not required.
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Reference:

Reference: % is only the start and end character of the regular expression. you can use/, # to start and end the regular expression. it is not ^ $ the first time I heard about it, I was taught ......

What you are talking about is Location Matching. what you are talking about is not one thing.
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% Is only the start and end of the regular expression. you can use /, #.
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Reference:

% Is only the start and end of the regular expression. you can use /, #.

The start and end of the regular expression are not ^ $ the first time I heard about it, I was taught ......
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After learning, I can't quite understand it ..
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The above error is reported. "." can match Chinese characters.
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This problem mainly applies regular expressions.
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Can you tell me why I want to add %?
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The reply was deleted by the administrator at 17:27:11, January 19 ,.