Question

$str1 = '10 sold';

$re = "/(?<Alpha>[a-zA-Z]*)(?<Numeric>[0-9]*)/";       
preg_match_all($re, $str1, $str1matches);

echo print_r($str1matches,1);

打印：

Array

(
    [0] => Array
        (
            [0] => 10
            [1] => 
            [2] => sold
            [3] => 
        )

    [Alpha] => Array
        (
            [0] => 
            [1] => 
            [2] => sold
            [3] => 
        )

    [1] => Array
        (
            [0] => 
            [1] => 
            [2] => sold
            [3] => 
        )

    [Numeric] => Array
        (
            [0] => 10
            [1] => 
            [2] => 
            [3] => 
        )

    [2] => Array
        (
            [0] => 10
            [1] => 
            [2] => 
            [3] => 
        )

)

但是为什么要打印这么长的数组呢？如何确定我的值（xxx和label）始终可用于哪个位置？

Answer 1

我使用简单的/^([0-9]+)\s*([a-zA-Z]+)$/正则表达式，因为you confirm输入字符串中有一个数字，然后是一个单词：

preg_match('/^([0-9]+)\s*([a-zA-Z]+)$/', '10 sold', $str1matches, PREG_OFFSET_CAPTURE);

请参阅PHP demo：

$str1 = '10 sold';
$re = "/^([0-9]+)\s*([a-zA-Z]+)$/";       
preg_match($re, $str1, $str1matches, PREG_OFFSET_CAPTURE);
echo print_r($str1matches[1]);
echo print_r($str1matches[2]);

$str1matches[1]将包含一个包含Group 1（数字）值及其位置的数组，$str1matches[2]将包含一个包含Group 2（word）值及其位置的数组。

正则表达式匹配位置

1 个答案: