Question

Could some one tell me why

//string
$content = 'random ${one.var} ${two.var} random';

//match
preg_match('/(?:(?<=\$\{))([\w.]+){1}(?=\})/i', $content, $matches);

is returning

print_R($matches);

//output
array(
   [0]=>one.var
   [1]=>one.var
);

What i want is

array(
   [0]=>one.var
   [1]=>two.var
);

Answer 1

Both the whole regex (0) as the inner capture () (1) match the same thing, so that part of the match makes sense. You probably want preg_match_all, which captures all matches…

preg_match_all('/(?<=\$\{)[\w.]+(?=\})/i', $content, $matches);