Analysis on the specific usage of PHP function ereg ()

In many advanced languages,Syntax: int ereg (string pattern, string, array [regs]);

Returned value: integer/Array

Function Type: Data Processing

Description of PHP function ereg ()

This function uses the pattern Rule to parse and compare strings. The value returned from the comparison result is placed in the array parameter regs, the regs [0] content is the original string, regs [1] is the first regular string, regs [2] is the second regular string, and so on. If the regs parameter is omitted, only comparison is performed. If it is found, the return value is true.

PHP function ereg () Example

Simple Example:

 
 

  
  
<? Php
  
  
If (ereg ("c", "abcdef ")){
// Description: determines whether abcdef contains the letter c.
  
  
Echo "through ";
  
  
} Else {
  
  
Echo "error ";
  
  
}
  
  
?>
 
 

The following PHP function ereg () is used to perform a simple check on the input email and check whether the user's email string contains the @ character, there are English letters or numbers before the @ character, followed by several strings, and the last decimal point can only contain two or three English letters. The super@mail.wilson.gs can pass the check, and the super@mail.wilson cannot pass the check.

 
 

  
  
<? Php
  
  
If (ereg ("^ [_. 0-9a-z-] + @ ([0-9a-z]
[0-9a-z-] +.) + [a-z] {2, 3} $ ", $ email ))
  
  
{
  
  
Echo "your email has passed the preliminary check ";
  
  
}
  
  
?>