Questions about regular expression matching

Obtain the matched characters in the Href attribute of A tag. For more information, see <divclass = & quot; a & quot; herf = & quot; regular match.
Obtain the Href attribute of A tag

Matched characters

Connection 1
Connection 2
Connection 3


You can use single quotes without quotation marks, but you cannot use either of them.

PHP code

  preg_match('//i', $str, $matches)

Why not?

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PHP code

$ Str = <
  
   
] *>/', $ Str, $ matches); print_r ($ matches [2]);
   
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PHP code
    
   
$ Str = <
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PHP code
      
     
[User: root Time: 14: 14: 52 Path:/home/liangdong/php] $ php preg. php Array ([0] => Array ([0] => Array ([0] => "[1] => '[2] =>) [2] => Array ([0] => http://www.baidu.com/[1] => http://www.baidu.com/[2] => http://www.baidu.com/) [User: root Time: 14: 14: 53 Path:/home/liangdong/php] $ cat preg. php