Use of preg regular function in PHP
the difference between 1.preg_match and Preg_match_all
The difference between Preg_match and Preg_match_all is that preg_match matches only once. The Preg_match_all all match until the end of the string. Cases:
Demo Code
Operation effect (Figure 1)
Operation effect (Figure 2)
Main Package function
Multi_process ();According to the parameters, create the number of pointers to the child process.Bright spot Function 1: The
PHP preg_replace () Regular replacement, unlike JavaScript regular substitution, PHP preg_replace () is the default is to replace all symbol matching conditions of the elements need our program processing data is not always pre-designed database
In Data acquisition and page analysis, often need to crawl the content of a given URL page, or the second, third level depth page content.
Here is a test example implementation, for reference only.
The code is as follows:
/*Match a given page
In our last article we took a look at the introduction of the PHP regular expression, then since the beginning of the study, then we will start to learn the use of the PHP regular expression, then the following specific in PHP how to use it, this
In the programming of the basic will use regular expression to deal with the data, then the following specific in PHP how to use it, this article through concrete examples, to explain the use of the PHP expression in the method.
Recently, using PHP
The basic syntax of php regular expressions is summarized in detail. First, let's take a look at two special characters: & amp; rsquo; ^ & amp; rsquo; and & amp; lsquo; $ & amp; rsquo; they are used to match The start and end of The string
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