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diff --git a/challenge-185/peter-campbell-smith/blog.txt b/challenge-185/peter-campbell-smith/blog.txt
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+https://pjcs-pwc.blogspot.com/2022/10/manipulating-characters.html
diff --git a/challenge-185/peter-campbell-smith/perl/ch-1.pl b/challenge-185/peter-campbell-smith/perl/ch-1.pl
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+#!/usr/bin/perl
+
+# Peter Campbell Smith - 2022-10-02
+# PWC 185 task 1
+
+use v5.28;
+use utf8;
+use warnings;
+
+# You are given MAC address in the form hhhh.hhhh.hhhh.
+# Write a script to convert the address to the form hh:hh:hh:hh:hh:hh.
+
+# Blog: https://pjcs-pwc.blogspot.com/2022/10/manipulating-characters.html
+
+my (@tests, $test);
+
+@tests = ('1ac2.34f0.b1c2', 'abc1.20f1.345a');
+
+# just do it
+for $test (@tests) {
+	say $test =~ m|^(..)(..).(..)(..).(..)(..)$| ? qq[\nInput:  $test\nOutput: $1:$2:$3:$4:$5:$6]: 'Invalid format';
+}
diff --git a/challenge-185/peter-campbell-smith/perl/ch-2.pl b/challenge-185/peter-campbell-smith/perl/ch-2.pl
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+#!/usr/bin/perl
+
+# Peter Campbell Smith - 2022-10-02
+# PWC 185 task 1
+
+use v5.28;
+use utf8;
+use warnings;
+binmode(STDOUT, ':utf8');
+
+# You are given a list of random strings.
+# Write a script to change the first four characters matching [a-z0-9] to x and keep the rest as it is.
+
+# Blog: https://pjcs-pwc.blogspot.com/2022/10/manipulating-characters.html
+
+my (@tests, $test, @list, $item, $j, $output);
+
+@tests = (['ab-cde-123', '123.abc.420', '3abc-0010.xy'], 
+	['A5h&kP.....z', '!"£$%^&*()', 'xxxx00000', 'abcd', 'ǀØΨ£‡⁇ aaaa']);
+
+# loop over tests
+for $test (@tests) {
+	@list = @$test;
+	
+	# initialise
+	say qq[\nInput: \@list = (] . join(', ', @list) . ')';
+	$output = '';
+	
+	# loop over items within test
+	for $item (@list) {
+		$item =~ s|^(.*?)[a-z0-9](.*?)[a-z0-9](.*?)[a-z0-9](.*?)[a-z0-9]|$1x$2x$3x$4x|;
+		$output .= qq[$item, ];
+	}
+	
+	# and print the answer
+	say qq[Output:        (] . substr($output, 0, -2) . ')';
+}