如何使用正则表达式替换圆括号的任何括号？

Question

Here is code:

$string="{1},[2],(3),<4>";
// Replaces closing square, curly, angle brackets with round brackets
$string = preg_replace('/\{\[\</', '(', $string);
$string = preg_replace('/\}\]\>/', ')', $string);

It didn't replace at all in that string... Any better coding than that?

Thanks.

Answer 1

{[< never occurs in your string. Use a character class or optional grouping.

$string = preg_replace('/[{[<]/', '(', $string);
$string = preg_replace('/[}>\]]/', ')', $string);

Alternative non character class approach:

$string = preg_replace('/(?:\{|<|\[)/', '(', $string);
$string = preg_replace('/(?:\}|>|\])/', ')', $string);

https://3v4l.org/URvcb