php正则表达式之preg_grep

Posted 2020-09-30 MarkZeng

array preg_grep ( string $pattern , array $input [, int $flags = 0 ] )

　　

pattern :模式
input:输入的数组
flags：如果设置为PREG_GREP_INVERT, 这个函数返回输入数组中与 给定模式pattern不匹配的元素组成的数组.

返回一个数组，结果为输入数组中值符合模式匹配的元素，格式为 array(‘key1‘=>value1,‘key2‘=>value2)；

 

$array = array("23.32","22","12.009",‘key‘=>"23.43.43",".29.8");

var_dump(preg_grep("/^(\d+)?\.\d+\.\d+$/",$array));

array (size=2)
  ‘key‘ => 

string

 ‘23.43.43‘ (length=8)
  3 => 

string

‘.29.8‘ (length=5)


使用PREG_GREP_INVERT的情况下：

$array = array("23.32","22","12.009",‘key‘=>"23.43.43",".29.8");

var_dump(preg_grep("/^(\d+)?\.\d+\.\d+$/",$array,PREG_GREP_INVERT));

 

array (size=3)
  0 => 

string

 ‘23.32‘ (length=5)
  1 => 

string

 ‘22‘ (length=2)
  2 => 

string

 ‘12.009‘ (length=6)