PHP / regex - 从字符串中获取特定数字

问题描述：

Need quick help with regexp, to search a string for

blah blah blah price 4.000 blah blah

and assign 4.000 or whatever number comes after price to a variable.

需要快速帮助regexp，搜索字符串 p>

  blah blah blah price 4.000 blah blah 
  code>  pre> 
 
 并将4.000或价格后的任何数字分配给变量。 p> 
  div>

答

preg_match('~price\s+(\S+)~', $input, $matches);
var_dump($matches);

答

$num = preg_replace('/price ([\d,\.]+)/', '\1', $string);

preg_match('/price ([\d,\.]+)/', $string, $matches);
$num = $matches[1];