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fwiw, rindex appears to be slightly faster:
use Benchmark qw(timethese); my $s = "abcdefg"; timethese( 6_000_000, { rindex => sub { my $i = rindex( $s, "cde" ) }, index => sub { my $i = index( $s, "cde" ) }, } );
Benchmark: timing 6000000 iterations of index, rindex...
index: 1 wallclock secs ( 1.14 usr + 0.00 sys = 1.14 CPU) @ 5263157.89/s (n=6000000)
rindex: 1 wallclock secs ( 1.02 usr + 0.00 sys = 1.02 CPU) @ 5882352.94/s (n=6000000)
their functional difference is that rindex starts from the end of the string, and index starts at the beginning. there is no difference in their usage.

In reply to Re: what is the difference between index and rindex by mreece
in thread what is the difference between index and rindex by jesuashok

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