Php 正则表达式和preg_match_all的问题
我也有一根很长的绳子:Php 正则表达式和preg_match_all的问题,php,regex,Php,Regex,我也有一根很长的绳子: $text = "[23,64.2],[25.2,59.8],[25.6,60],[24,51.2],[24,65.2],[3.4,63.4]"; 它们是坐标。我想从[]s中提取每个x,y 我真的很讨厌正则表达式,我仍然无法正确地编写它 我试过了 $pattern = "#\[(.*)\]#"; preg_match_all($pattern, $text, $matches); 但它不起作用。任何人都可以帮我吗?你应该使用*?来减少贪婪。否则,它可能会匹配太长的子字
$text = "[23,64.2],[25.2,59.8],[25.6,60],[24,51.2],[24,65.2],[3.4,63.4]";
它们是坐标。我想从[]s中提取每个x,y
我真的很讨厌正则表达式,我仍然无法正确地编写它
我试过了
$pattern = "#\[(.*)\]#";
preg_match_all($pattern, $text, $matches);
但它不起作用。任何人都可以帮我吗?你应该使用
*?
来减少贪婪。否则,它可能会匹配太长的子字符串。在您的案例中,有时使用否定字符类,([^[\]]*)
也很有用
但最好是对你想要的东西特别明确:
preg_match_all("#\[([\d,.]+)]#", $text, $matches);
这样,它将只匹配\小数、逗号和点。哦,需要转义开头的[
preg_match_all("#\[([\d.]+),([\d.]+)]#", $text, $matches, PREG_SET_ORDER);
将已经为您提供分开的X和Y坐标。请尝试将PREG\u SET\u ORDER
作为第四个参数,该参数将为您提供:
Array
(
[0] => Array
(
[0] => [23,64.2]
[1] => 23
[2] => 64.2
)
[1] => Array
(
[0] => [25.2,59.8]
[1] => 25.2
[2] => 59.8
)
[2] => Array
(
[0] => [25.6,60]
[1] => 25.6
[2] => 60
)
您需要将星号设置为“懒惰”: 但是这个怎么样
$pattern = "#\[(\d+(\.\d+)?),(\d+(\.\d+)?)\]#";
在您的代码中,这将产生
Array
(
[0] => Array
// ...
[1] => Array
(
[0] => 23
[1] => 25.2
[2] => 25.6
[3] => 24
[4] => 24
[5] => 3.4
)
[2] => Array
//...
[3] => Array
(
[0] => 64.2
[1] => 59.8
[2] => 60
[3] => 51.2
[4] => 65.2
[5] => 63.4
)
[4] => Array
//...
)
这应该做到:
$string = '[23,64.2],[25.2,59.8],[25.6,60],[24,51.2],[24,65.2],[3.4,63.4]';
if (preg_match_all('/,?\[([^\]]+)\]/', $string, $matches)) {
print_r($matches[1]);
}
它打印:
[0] => string(7) "23,64.2"
[1] => string(9) "25.2,59.8"
[2] => string(7) "25.6,60"
[3] => string(7) "24,51.2"
[4] => string(7) "24,65.2"
[5] => string(8) "3.4,63.4"
regexp的细分:
,? // zero or one comma
\[ // opening bracket
([^\]]+) // capture one or more chars until closing bracket
\] // closing bracket
要获得x,y坐标,您可以:
$coords = array();
foreach ($matches[1] as $match) {
list($x, y) = explode(',', $match);
$coords[] = array(
'x' => (float)$x,
'y' => (float)$y
);
}
非常感谢!我刚刚意识到数组是二维的。我在回显$matches[1]时不断收到错误“array”。$matches[1][0]效果更好,现在只需构建循环。再次感谢!问题已修复
$coords = array();
foreach ($matches[1] as $match) {
list($x, y) = explode(',', $match);
$coords[] = array(
'x' => (float)$x,
'y' => (float)$y
);
}