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This article mainly introduces how PHP uses ereg () and eregi (). It has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

Ereg () and eregi ()

Ereg () is the matching function of regular expressions in the POSIX extension library. Eregi () is a case-ignored version of the ereg () function. Both functions are similar to preg_match, but the function returns a Boolean value, indicating whether the match was successful or not. It is important to note that the first argument of the POSIX extension library function accepts a regular expression string, that is, no delimiter is required. For example, Code 6.2 is a method for security checking of file names.

Security check of Code 6.2 File name

The code is as follows:

In general, using the Perl-compatible regular expression matching function perg_match () is faster than using ereg () or eregi (). If you are just looking for whether a string contains a substring, it is recommended that you use the strstr () or strpos () function.

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