Usage of non-Greedy pattern matching in php Regular Expressions

Here, we will briefly introduce the usage of non-Greedy pattern matching in php regular expressions through examples. If you need it, please refer to it.

Here, we will briefly introduce the usage of non-Greedy pattern matching in php regular expressions through examples. If you need it, please refer to it.

We usually write as follows:

The Code is as follows:

$ Str = "";
Preg_match ("/http :(. *) com/", $ str, $ matches );
Print_r ($ matches );

Result:

The Code is as follows:

Array ([0] => [1] => // www. baidu/. com? Url = www. sina .)

Non-Greedy pattern matching:

The Code is as follows:

$ Str = "";
Preg_match ("/http :(.*?) Com/", $ str, $ matches );
Print_r ($ matches );

Result:

The Code is as follows:

Array ([0] => [1] => // www. baidu /.)

Simply put, as long as a character is followed by a specified number of special characters, matching is a non-Greedy mode. Have you understood this?

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