Multi-line regex search in whole file

Question

I\'ve found loads of examples on to to replace text in files using regex. However it all boils down to two versions:
1. Iterate over all lines in the file and apply regex to

Answer 1

Here's the Answer:
There is no easy way

I found a StreamRegex-Class which could be able to do what I am looking for.
From what I could grasp of the algorithm:

• Start at the beginning of the file with an empty buffer
• do (
  • add a chunk of the file to the buffer
  • if there is a match in the buffer
    • mark the match
    • drop all data which appeared before the end of the match from the buffer
• ) while there is still something of the file left

That way it is not nessesary to load the full file -- or at least the chances of loading the full file in memory are reduced...
However: Worst case is that there is no match in the whole file - in this case the full file will be loaded into memory.