Questions about regular expression matching

Obtain the matched characters in the Href attribute of A tag.
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 = <
  
   
Connect 3 to 3STR; preg_match_all ('/] + href = (["\']?) ([^ \ S "\ '] +) \ 1 [^>] *>/', $ str, $ matches); print_r ($ matches [2]);
   
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PHP code
    
   
$ Str = <
     
      
Connection 1
      
Connection 2
      
Connect 3 html; preg_match_all ('/href = (["\'])? ([^ \ S "\ '] +)/is', $ str, $ matches); print_r ($ matches );
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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
         Connection 1
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Connect 3EOF; preg_match_all ('/