如果有之後的任何字符「」，然後按他們之間<space>

Question

我有一些字符串這樣的：

$str = "it is a test,it is a test"; 
$str = "it is a test ,it is a test"; 
$str = "it is a test, it is a test"; 
$str = "it is a test , it is a test"; 

現在，我想這對所有的人：

$str = "it is a test, it is a test"; 

---

現在，我可以通過幾個步驟完成這項工作：

1. str_replace(" , ",",","$str");
2. str_replace(" ,",",","$str");
3. str_replace(", ",",","$str");
4. str_replace(",",", ","$str");

然後輸出將是我想要的。現在我想知道，是否有任何REGEX代碼可以一步完成此操作？

Answer 1

您可以使用此與,[space]

\s*,\s* 

即替換：

preg_replace('/\s*,\s*/', ', ', $str);