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See PHI766. Build log chunk processing does a `preg_split()` on slices, but this isn't terribly efficient. We can get the same count more cheaply by just using `substr_count()` a few times. (I also tried `preg_match_all()`, which was between the two in speed.)

See PHI766. Ref T13164. Build log chunk processing does a `preg_split()` on slices, but this isn't terribly efficient. We can get the same count more cheaply by just using `substr_count()` a few times. (I also tried `preg_match_all()`, which was between the two in speed.)

See PHI766. Ref T13164. Build log chunk processing does a `preg_split()` on slices, but this isn't terribly efficient. We can get the same count more cheaply by just using `substr_count()` a few times. (I also tried `preg_match_all()`, which was between the two in speed.)