Php ereg () email verification and file name verification

Php tutorial ereg () email verification and file name verification
String comparison parsing.

Syntax: int ereg (string pattern, string, array [regs]);

Returned value: integer/Array

Function Type: Data Processing

 
 
Description

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.
 
 
Example
This example was proposed by the markus@dnet.it in 14-jun-1999. A simple check can be performed on the e-mail entered by the user to check whether the user's e-mail 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 (eregi ("^ [_. 0-9a-z-] + @ ([0-9a-z] [0-9a-z-] + .) + [a-z] {2, 3} $ ", $ email )){
Echo "your email has passed the preliminary check ";
}
?>

Take a look

Dedecms file Verification

If (! Eregi ("^ [a-z0-9 _-] {1,}. lib. php $", $ filename ))
{
Showmsg ('the file is not a standard tag fragment file and cannot be edited here! ','-1 ');
Exit ();
}
$ Fp = fopen (dedeinc. '/taglib/'. $ filename, 'R ');
$ Democode = fread ($ fp, filesize (dedeinc. '/taglib/'. $ filename ));
Fclose ($ fp );
$ Title = "Modify tags ";