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preg_split("/({{\s*(?:(?!}}).)+\s*}})/s", file_get_contents('data.txt'));
That line makes Apache reset the connection. data.txt is approximately 12 kB.
What am I doing wrong, can I optimize the regex somehow?
Try this regular expression instead:
The main improvements:
(?>…)– atomic grouping to avoid backtracking(?:[^}]|}[^}])+– no look-around, no non-greedy matching