Php regular expression preg_replace

Source: Internet
Author: User
Tags mixed php regular expression
The code is as follows: Copy code
$ Mode = "/^ [a-z] [-_.]? [A-zd] * @ [a-z0-9] + [.] [a-z] {2, 4}/I ";
$ Str = "a12345@j111cn.net ";
Echo $ str. 'If (preg_match ($ mode, $ str, $ arr )){
Echo 'succeed -- <font color = red> '. $ arr [0];
} Else {
Echo 'failed ';
}

 


D contains all numbers [0-9]
D except all numbers [^ 0-9]
W contains all English characters [a-za-z_0-9]
W except all English characters [^ a-za-z_0-9]
S contains blank areas such as carriage return, line feed, and paging [fnr]


Preg_match_all (string pattern, string subject, array matches [, int flags])
Capture detailed content, collect webpages, and analyze text

The code is as follows: Copy code
Preg_replace (mixed pattern, mixed replacement, mixed subject [, int limit])
Preg_replace (mixed pattern, mixed replacement, mixed subject [, int limit])


Tip 1: The replacement content can be a regular or array regular
2. The replacement content can be replaced by the modifier e.

The code is as follows: Copy code
Preg_split (string pattern, string subject [, int limit [, int flags])

 

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