在字符串中的特定字符后获取值

Question

I have a string as follows

$str = 'asdasdasd,sdfsdfsdf myNumber=1234, 2323 dfdfdf9898 sdfsdfdsf 234';

I'd like to return the digits within myNumber=1234 .

Desired Outcome

$str = '1234';

I currently use the following regex preg_replace('/\\myNumber=\\d+/', '', $y) to replace when required, which works perfectly, but I'm not sure how I could use this to extract the numbers after the = sign from myNumber=1234 ?

Answer 1

You could use the following function:

function getStringBetween($str, $from, $to)
{
    $sub = substr($str, strpos($str, $from) + strlen($from), strlen($str));
    return substr($sub, 0, strpos($sub, $to));
}

Then you can use it this way:

$a = getStringBetween($str, 'myNumber=', ',');

which will give you the output 1234 since its between the given strings.

Answer 2

You can use a preg_match with the following regex:

\bmyNumber=(\d+)

See the regex demo

The value will be available in Group 1. (\\d+) matches and captures 1+ digits into a group that will be part of the resulting array.

Demo :

$re = '~\bmyNumber=(\d+)~'; 
$str = "asdasdasd,sdfsdfsdf myNumber=1234, 2323 dfdfdf9898 sdfsdfdsf 234"; 
preg_match($re, $str, $m);
echo $m[1];