用regex php替换所有的出现

Question

I need to replace all the occurrence of the string World [*] : with 2000.

Output: 20002000hello

How can I achieve that? I am currently using the below code but it is not working.

preg_replace("/World [(.*?)] : /", "2000", "World [23] : World[125] : hello",-1)

Answer 1

You can use:

$out = preg_replace('/World\s*\[.*?\] : /', "2000", "World [23] : World[125] : hello");
//=> 20002000hello

[ and ] are special regex meta characters that need to escaped and make space after World optional with 0 or more matches.