2 files changed, 68 insertions, 0 deletions
diff --git a/challenge-273/mark-anderson/raku/ch-1.raku b/challenge-273/mark-anderson/raku/ch-1.raku
new file mode 100644
index 0000000000..33af93d32c
--- /dev/null
+++ b/challenge-273/mark-anderson/raku/ch-1.raku
@@ -0,0 +1,14 @@
+#!/usr/bin/env raku
+use Test;
+
+is perc-of-char('perl',      'e'), 25;
+is perc-of-char('java',      'a'), 50;
+is perc-of-char('python',    'm'),  0;
+is perc-of-char('ada',       'a'), 67;
+is perc-of-char('ballerina', 'l'), 22;
+is perc-of-char('analitik',  'k'), 13;
+
+sub perc-of-char($str, $char)
+{
+    round 100 * $str.indices($char) / $str.chars
+}
diff --git a/challenge-273/mark-anderson/raku/ch-2.raku b/challenge-273/mark-anderson/raku/ch-2.raku
new file mode 100644
index 0000000000..d769f0bb69
--- /dev/null
+++ b/challenge-273/mark-anderson/raku/ch-2.raku
@@ -0,0 +1,54 @@
+#!/usr/bin/env raku
+use Test;
+
+ok  b-after-a("aabb");
+nok b-after-a("abab");
+nok b-after-a("aaa");
+ok  b-after-a("bbb");
+ok  b-after-a("aaabxyzbcde");
+nok b-after-a("aaabxayzbcde");
+nok b-after-a("aaabxyzbcade");
+nok b-after-a("aaabxyzcde");
+
+ok  b-after-a-pos("aabb");
+nok b-after-a-pos("abab");
+nok b-after-a-pos("aaa");
+ok  b-after-a-pos("bbb");
+ok  b-after-a-pos("aaabxyzbcde");
+nok b-after-a-pos("aaabxayzbcde");
+nok b-after-a-pos("aaabxyzbcade");
+nok b-after-a-pos("aaabxyzcde");
+
+ok  b-after-a-indices("aabb");
+nok b-after-a-indices("abab");
+nok b-after-a-indices("aaa");
+ok  b-after-a-indices("bbb");
+ok  b-after-a-indices("aaabxyzbcde");
+nok b-after-a-indices("aaabxayzbcde");
+nok b-after-a-indices("aaabxyzbcade");
+nok b-after-a-indices("aaabxyzcde");
+
+# Note: I may have misunderstood the problem. I thought it was to check
+# for a 'b' and then a 'b' after the first 'b' and no 'a' after the first
+# 'b' but it looks like others have checked for a 'b' and no 'a' after
+# that first 'b' 🤷
+
+sub b-after-a($str)
+{
+    $str ~~ / ^ <-[b]>* b <-[a]>* b <-[a]>* $ /
+}
+
+sub b-after-a-pos($str)
+{
+    my $b         = $str ~~ m:1st          / b / || return False;
+    my $a-after-b = $str ~~ m:c($b.pos):1st/ a /;
+    my $b-after-b = $str ~~ m:c($b.pos):1st/ b /;
+    $b-after-b and not $a-after-b
+}
+
+sub b-after-a-indices($str)
+{
+    my @a = $str.indices('a');
+    my @b = $str.indices('b');
+    @b > 1 and all(@a) < @b.head 
+}