I have the following string in php:\[code\]$string = 'FEDCBA9876543210';\[/code\]The string can be have 2 or more (I mean more) hexadecimal charactersI wanted to group string by 2 like :\[code\]$output_string = 'FE
C:BA:98:76:54:32:10';\[/code\]I wanted to use regex for that, I think I saw a way to do like "recursive regex" but I can't remember it.Any help appreciated 
C:BA:98:76:54:32:10';\[/code\]I wanted to use regex for that, I think I saw a way to do like "recursive regex" but I can't remember it.Any help appreciated