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diff --git a/challenge-020/jo-37/perl/ch-1.pl b/challenge-020/jo-37/perl/ch-1.pl
new file mode 100755
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+++ b/challenge-020/jo-37/perl/ch-1.pl
@@ -0,0 +1,59 @@
+#!/usr/bin/perl -s
+
+use v5.16;
+use Test2::V0;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [STR]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+STR
+    String to be split into groups of repeated characters
+
+EOS
+
+
+### Input and Output
+
+say for @{split_string(shift)};
+
+
+### Implementation
+
+sub split_string {
+    # Capture each repeated single character. There are two capture
+    # groups in this regex: one captures the character and the other the
+    # repeated character. Using embedded code to collect the repeated
+    # chars.
+    my @split;
+    shift =~ /(((.)\g{-1}*)(?{push @split, $^N}))*/;
+    \@split;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is split_string('ABBCDEEF'),
+        [qw(A BB C D EE F)], 'example';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}