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:
: This article mainly introduces the php-preg-1, for PHP tutorials interested in students can refer. Q. Regular expression
Regular expressions are composed of three parts: atoms, metacharacters, and pattern correction. Atoms are common
Q. Regular Expressions
Regular expressions are made up of atoms, meta-characters, and pattern corrections in three parts. The atom is also the ordinary character.
Metacharacters
\d: Matches any decimal number [0-9]
\s: Matches any white space
Mixed preg_replace (mixed $pattern, mixed $replacement, mixed $subject [, int $limit =-1 [, int & $count]])
Returns an array if subject is an array, otherwise returns a string. If an error occurs, NULL is returned. Modifier \e is deprecated,
In the use of regular expressions, I have been in the guerrilla, it is time to come up with a summary. Because of the irresistible reason of stupidity, can only choose to simply say, only write down the ASCII encoding character matching and
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
Objective
PHP is a large number of web-used background CGI development, usually after the user data data to produce some results, but if the user input data is incorrect, there will be problems, such as someone's birthday is "February 30!" How
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
: This article mainly introduces the PHP regular expression syntax summary. if you are interested in the PHP Tutorial, you can refer to it. Http://bbs.chinaunix.net/forum.php? Mod = viewthread & tid = 4101636.
Use well
Regular expressionPHP is often
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