what preg match

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: 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

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:

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

Note:Backslashes have special meanings in both single-quote strings and double-quote strings, so to match a backslash, the pattern must be written as "\\\\". "/\\/", first it as a string, the backslash will be escaped, then the result of escaping is/

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,

the difference between 1.preg_match and Preg_match_allThe 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:2. The difference between greedy and non-

delimitation Symbol :A variety of can, commonly used for//Atoms :The smallest matching unit (placed in the delimiter), in a regular expression, at least one atom1, print characters (A-Z a-z 0-9 [email protected]#$%^&* () _+ ... ) and nonprinting

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