用正则表达式中的另一个字符替换字符PHP

Question

当前，这是我有的preg_replace字符串。

$mtg_post['post_content'] = preg_replace("[^\\x20-\\x7e]", "",$ability); 

这是$ ability中包含的数据示例。

At the beginning of your upkeep, put a doom counter on Armageddon Clock.£At the 
beginning of your draw step, Armageddon Clock deals damage equal to the number 
of doom counters on it to each player.£{4}: Remove a doom counter from Armageddon 
Clock. Any player may activate this ability but only during any upkeep step. 

我想用2xreturn或新段落来替换£字符吗？在正则表达式，所以行看起来像这样，但不太确定如何实现这一点。

At the beginning of your upkeep, put a doom counter on Armageddon Clock. 

At the beginning of your draw step, Armageddon Clock deals damage equal 
to the number of doom counters on it to each player. 

{4}: Remove a doom counter from Armageddon Clock. Any player may activate 
    this ability but only during any upkeep step. 

Answer 1

无需这里正则表达式，只需使用str_replace()：

$out = str_replace("£", "\n\n", $in);