readdir is low-level, avoid it , use Path::Tiny 
use Path::Tiny qw/ path /;
my @files = path( 'anypath' )->children( qr/^[a-z].+\.txt$/ );

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In reply to Re: regex to capture files that start with a lowercase letter (path tiny) by Anonymous Monk
in thread regex to capture files that start with a lowercase letter by fionbarr

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