On the use of non-greedy pattern matching in regular expression of PHP, a brief talk on regular expression _php tutorial

On the use of non-greedy pattern matching in regular expressions of PHP, talking about regular expressions

Usually we write this:

Copy the Code code as follows:
$str = "http://www.baidu/.com?url=www.sina.com/";
Preg_match ("/http: (. *) com/", $str, $matches);
Print_r ($matches);

Results:

Copy the Code code as follows:
Array ([0] = http://www.baidu/.com?url=www.sina.com [1] =//www.baidu/.com?url=www.sina.)

Non-greedy pattern matching:

Copy the Code code as follows:
$str = "http://www.baidu/.com?url=www.sina.com/";
Preg_match ("/http: (. *?) com/", $str, $matches);
Print_r ($matches);

Results:

Copy the Code code as follows:
Array ([0] = http://www.baidu/.com [1] =//www.baidu/.)

Simply put, the match is a non-greedy mode as long as you follow a character with a limited number of characters. Do the little friends understand?

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