Parse through a string php and replace substrings

Question

I have a string, in PHP and the string has occurrences of the pattern %%abc%%(some substring)%%xyz%%

There are multiple occurrences of such substrings withi

Answer 1

Use preg_replace_callback(), like this:

preg_replace_callback( '#%%abc%%(.*?)%%xyz%%#', function( $match) {
    // Do some logic (with $match) to determine what to replace it with
    return 'replacement';
}, $master_string);