如何使用一个正则表达式而不是两个匹配值？

Question

I want to catch values from this string:

$data='1=A
5=B
7=F
11=G';

The next piece of code works fine, but is using two regular expressions. Is there a way to use only one?

$i = 1;

if (!preg_match("/
$i=(.*)/",$data,$m))
{
  preg_match("/^$i=(.*)/",$data,$m);
}

Answer 1

I think multiline mode is what you're looking for:

preg_match("/^$i=(.*)/m",$data,$m);

The m modifier allows the start anchor (^) to match the beginning of any line instead of just the beginning of the string. It still prevents a match on (11=G) because the 1 has to be at the beginning of the line and immediately by =. Is that what you meant?