Why? They're not compatible and not a drop-in replacement.
They're also likely a little bit slower, especially on large datasets. It's really hard to beat GNU grep. (Which is famously 3 cycles/byte in the trivial case. Great exercise though.) But for the most part performance is secondary to feature partity.
They're also likely a little bit slower, especially on large datasets. It's really hard to beat GNU grep. (Which is famously 3 cycles/byte in the trivial case. Great exercise though.) But for the most part performance is secondary to feature partity.