php - 根据字母后跟数字拆分字符串

Question

我尝试拆分字符串 A1B22C333 以获得数组 [0] => A1 , [1] => B22, [2] => C333。这是我失败的尝试:

$mystring = "A1B22C333";
$pattern  = "[\w\d+]";
$arr = preg_split("/".$pattern."/", $mystring);
print_r($arr);

但是我得到:数组 ( [0] => [1] => [2] => [3] => [4] => [5] => [6] => [7] => [8] => [9] => )

Answer 1

你可以使用像这样的正则表达式

(?<!^)(?=\D)

参见 regex demo

(?<!^)(?=\D)匹配不在字符串开头和非数字字符之前的位置。

参见 IDEONE demo :

$mystring = "A1B22C333";
$pattern  = '~(?<!^)(?=\D)~';
$arr = preg_split($pattern, $mystring);
print_r($arr);
// => Array( [0] => A1    [1] => B22    [2] => C333 )

您还可以将正则表达式缩短为一个 '~(?=\D)~' (非数字前的位置)如果你使用 PREG_SPLIT_NO_EMPTY ( demo ):

$pattern  = '~(?=\D)~';
$arr = preg_split($pattern, $mystring, -1, PREG_SPLIT_NO_EMPTY);