PHP 从字符串中提取数字 [英] PHP Extract numbers from a string

问题描述

我想从 PHP 中的字符串中提取数字，如下所示:

如果 string = 'make1to6' 我想提取整个字符串中 'to' 子字符串前后的数字字符.即要提取1和6

if the string = 'make1to6' i would like to extract the numeric character before and after the 'to' substring in the entire string. i.e. 1 and 6 are to be extracted

我将使用这些返回值进行一些计算.'我想提取整个字符串中to"子字符串前后的数字字符.即要提取 1 和 6

i will be using these returned values for some calculations.' i would like to extract the numeric character before and after the 'to' substring in the entire string. i.e. 1 and 6 are to be extracted

字符串的长度不固定，最大长度为10个字符.字符串中'to'两边的数字最多为两位.

The length of the string is not fixed and can be a max of 10 characters in length.The number can be of max two digits on either side of 'to' in the string.

一些示例字符串值:

sure1to3
ic3to9ltd
anna1to6
joy1to4val
make6to12
ext12to36

想到类似的东西:

function beforeTo(string) {

    return numeric_value_before_'to'_in_the_string;

}


function afterTo(string) {

    return numeric_value_after_'to'_in_the_string;

}

我将使用这些返回值进行一些计算.

i will be using these returned values for some calculations.

推荐答案

您可以使用正则表达式，它应该与您的规范完全匹配:

You can use a regular expression as such, it should match exactly your specification:

$string = 'make6to12';
preg_match('{^.*?(?P<before>\d{1,2})to(?P<after>\d{1,2})}m', $string, $match);
echo $match['before'].', '.$match['after']; // 6, 12

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