如果“，”之后有任何字符，则在它们之间按<space>

Question

我有一些像这样的字符串：

$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";

现在我想要所有这些：

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

现在，我可以分几步完成：

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

然后输出将是我想要的。现在我想知道，有没有任何REGEX代码可以一步完成呢？

Answer 1

您可以使用它并将其替换为,[space]

\s*,\s*

即：

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