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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2025, Bob Lied
#=============================================================================
# ch-1.pl Perl Weekly Challenge 330 Task 1 Clear Digits
#=============================================================================
# You are given a string containing only lower case English letters and
# digits. Write a script to remove all digits by removing the first digit
# and the closest non-digit character to its left.
# Example 1 Input: $str = "cab12"
# Output: "c"
# Round 1: remove "1" then "b" => "ca2"
# Round 2: remove "2" then "a" => "c"
# Example 2 Input: $str = "xy99"
# Output: ""
# Example 3 Input: $str = "pa1erl"
# Output: "perl"
#=============================================================================
use v5.40;
use Getopt::Long;
my $Verbose = false;
my $DoTest = false;
my $Benchmark = 0;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose, "benchmark:i" => \$Benchmark);
my $logger;
{
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init({ level => ($Verbose ? $DEBUG : $INFO ),
layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
$logger = Log::Log4perl->get_logger();
}
#=============================================================================
exit(!runTest()) if $DoTest;
exit( runBenchmark($Benchmark) ) if $Benchmark;
say clearDigits($_) for @ARGV;
#=============================================================================
sub clearDigits($str)
{
while ( $str =~ s/(?:^|[a-z])[0-9]//g ) { }
return $str;
}
sub runTest
{
use Test2::V0;
is( clearDigits("cab12" ), "c", "Example 1");
is( clearDigits("xy99" ), "", "Example 2");
is( clearDigits("pa1erl"), "perl", "Example 3");
is( clearDigits("7abc"), "abc", "Starts with digits");
done_testing;
}
sub runBenchmark($repeat)
{
use Benchmark qw/cmpthese/;
cmpthese($repeat, {
label => sub { },
});
}
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