Anonip profiling - column based vs. regex based IP detection

profile.sh

#!/usr/bin/env bash

n_runs=10

if ! [ -z ${1+x} ]; then
    n_runs="$1"
fi

run () {
    result=0
    for _ in $(seq 1 $n_runs); do
        res=$(python -m cProfile ./anonip.py "$@" --input ./access.log | grep "function calls" | awk '{print $8}')
        result=$(echo "$result + $res" | bc)
    done
    echo "$(echo "$result / $n_runs" | bc -l | grep -o '.*[1-9]' | sed 's/^\./0./')"
}

regex_result=$(run --regex "(?:^(.*) - - |.* - somefixedstring\: (.*) - .* - (.*))")
column_result=$(run)
diff=$(echo "scale=2;100 - (100 * $column_result / $regex_result)" | bc -l | sed 's/^\./0./')

echo "regex based: $regex_result seconds average"
echo "column based: $column_result seconds average"
echo "column based detection is ${diff}% faster than regex based detection"