Below is an example snippet of code to test for performance of
regex matches. I need to parse a large log and extract data from
it and i've noticed a huge increase in time of the loop when
reading and using regex.
...
auto alert = regex(r"^Alert ([0-9]+)");
while ((line = file.readln()) !is null)
{
auto m = match(line, alert);
if (m)
{
alerts++;
}
counter++;
}
...
Using the above example i parse about 700K lines per second (i'm
reading from an SSD). If i comment out the regex match function,
i read at 4.5M lines per second. Considering i need to use about
8 regex matches and extract data, this figure further drops to
about 100K lines per second.
Is there anything i can do to speed up regex matching in such a
scenario? Are there any tips you can share to speed things up?
Thanks.
