use strict;
use warnings;
use feature qw( switch say );

sub test_it {
    my $value = shift;
    given($value) {
        when(/aaa/) { return 'wanna' } 
        when(/bbb/) { return 'be' } 
        when(/ccc/) { return 'startin' }
        default     { return 'somethin' }
    }
}
 
foreach my $str (qw[testaaa testbbb testccc testddd]) {
    say test_it($str);
}

##</code><code>##

use strict;
use warnings;
use feature qw( switch say );
use Getopt::Long;

my $tester = 'test_it';
GetOptions("test=s" => \$tester);

sub test_it {
    my $value = shift;
    given($value) {
        when(/aaa/) { return 'wanna' } 
        when(/bbb/) { return 'be' } 
        when(/ccc/) { return 'startin' }
        default     { return 'somethin' }
    }
}

sub test_it2 {
    my $value = shift;
    do {
        no warnings;
        given($value) {
            when(/aaa/) { 'wanna' } 
            when(/bbb/) { 'be' } 
            when(/ccc/) { 'startin' }
            default     { 'somethin' }
        }
    };
}

sub test_it3 {
    my $value = shift;
    do {
        local $_ = $value;
        if(/aaa/)    { 'wanna' } 
        elsif(/bbb/) { 'be' } 
        elsif(/ccc/) { 'startin' } 
        else         { 'somethin' }
    };
}
 
foreach my $str (qw[testaaa testbbb testccc testddd]) {
    say $main::{$tester}->($str);
} 

##</code><code>##

#lang scheme
(define (test-it value)
  (match value        
    [(regexp #rx"aaa") "wanna"]
    [(regexp #rx"bbb") "be"]
    [(regexp #rx"ccc") "startin"]
    [_ "somethin"]))

(for ([str '("testaaa" "testbbb" "testccc" "testddd")]) 
  (printf "~a~n" (test-it str)))