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#!/usr/bin/perl
=begin comment
## Task 2: B After A
**Submitted by:** [Mohammad Sajid Anwar][2]
You are given a string, `$str`.
Write a script to return `true` if there is at least one `b`, and no `a` appears
after the first `b`.
**Example 1**
```
Input: $str = "aabb"
Output: true
```
**Example 2**
```
Input: $str = "abab"
Output: false
```
**Example 3**
```
Input: $str = "aaa"
Output: false
```
**Example 4**
```
Input: $str = "bbb"
Output: true
```
[2]: https://manwar.org/
=end comment
=cut
use strict;
use warnings;
use autodie;
use Exporter;
our $VERSION = '1.0.0';
our @EXPORT_OK = qw(b_after_a);
sub b_after_a {
my $str = shift // q{};
# Regular expression to match the string
## no critic (RegularExpressions::RequireDotMatchAnything)
my $re = qr{
^ # Start of the string
[^b]* # Match any character except 'b' zero or more times
b+ # Match 'b' one or more times
[^a]* # Match any character except 'a' zero or more times
$ # End of the string
}mx;
## use critic
# Test the string against the regular expression and return the result
if ( $str =~ $re ) {
return 1;
}
return 0;
}
1;
__END__
=head1 NAME
Task2: B After A
=head1 VERSION
This documentation refers to Task2 version 1.0.0
=head1 EXPORTS
The function L</b_after_a> is exported by default.
=head1 USAGE
use strict;
use warnings;
use feature qw(say);
use Task2 qw(b_after_a);
my $str1 = 'aabb';
my $str2 = 'abab';
say b_after_a($str1); # Output: 1
say b_after_a($str2); # Output: 0
=head1 DESCRIPTION
Given a string, C<$str>, the function C<b_after_a> returns true if there is at
least one 'b', and no 'a' appears after the first 'b'.
=head1 REQUIRED ARGUMENTS
=over 4
=item C<$str>
A string.
=back
=head1 OPTIONS
None.
=head1 DIAGNOSTICS
None.
=head1 EXIT STATUS
None.
=head1 CONFIGURATION
None.
=head1 DEPENDENCIES
None.
=head1 INCOMPATIBILITIES
None reported.
=head1 BUGS AND LIMITATIONS
None reported.
=head1 AUTHOR
Ian Goodnight
=head1 LICENSE AND COPYRIGHT
This software is released under the terms of theGNU General Public License
Version 3.
=cut
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