Solution to task 1

1 files changed, 65 insertions, 0 deletions

diff --git a/challenge-272/jo-37/perl/ch-1.pl b/challenge-272/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..9ec3849c1b
--- /dev/null
+++ b/challenge-272/jo-37/perl/ch-1.pl
@@ -0,0 +1,65 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use Regexp::Common 'net';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [STR]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+STR
+    "defang" string
+
+EOS
+
+
+### Input and Output
+
+say defang(shift);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/06/07/ch-272.html#task-1
+
+
+sub defang {
+    return /^$RE{net}{IPv4}$/ &&
+
+    s([.])([.])gr
+
+    for shift;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is defang("1.1.1.1"), "1[.]1[.]1[.]1", "example 1";
+        is defang("255.101.1.0"), "255[.]101[.]1[.]0", "example 2";
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is defang("256.0.0.1"), F(), 'invalid address';
+        is defang("1.0.0.256"), F(), 'invalid address';
+	}
+
+    done_testing;
+    exit;
+}