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Besides, the "eq" is actually converting the integer back to a string, which will cost performance.
#!/usr/bin/env perl use strict; use warnings; use Benchmark 'timethis'; timethis (10_000_000, "valid_int ('18446744073709551614')"); sub valid_int { my $num = shift; return unless $num =~ /^\d+$/a; return int $num eq $num; } __END__ timethis 10000000: 8 wallclock secs ( 7.93 usr + 0.00 sys = 7.93 CP +U) @ 1261034.05/s (n=10000000)

So, less than a microsecond on my aging system. Doubtless this can be improved upon (although about half the time taken appears to be the regex so there's a limit there too).

In reply to Re^7: Reliably parsing an integer by hippo
in thread Reliably parsing an integer by rdiez

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