php从字符串中剥离非货币字符

Question

我有这个字符串

From: £5.95 (per linear metre)

我只想保留£5.95。

我知道这是用preg_replace完成的但是怎么做？

$string = "From: £5.95 (per linear metre)";
    echo preg_replace("", "", $string);

Answer 1

preg_replace('/[^0-9.£]/', '', $string);

Answer 2

这应该适合你：

<?php

    $str = "From: £5.95 (per linear metre)";
    preg_match_all("/From:\s(.*\d+)/", $str, $matches);
    echo $matches[1][0];

?>