Day 2: regex with backrefs

diff --git a/2025/03.pl b/2025/03.pl
new file mode 100755 (executable)
index 0000000..9e4a966
--- /dev/null
+++ b/2025/03.pl
@@ -0,0 +1,11 @@
+#!/usr/bin/perl -w
+
+use v5.42;
+
+my $sum;
+for my ($x, $y) (<> =~ /\d+/g) {
+       for ($x .. $y) {
+               $sum += $_ if /^(\d+)\1$/;
+       }
+}
+say $sum;

diff --git a/2025/04.pl b/2025/04.pl
new file mode 100755 (executable)
index 0000000..36c4b97
--- /dev/null
+++ b/2025/04.pl
@@ -0,0 +1,11 @@
+#!/usr/bin/perl -w
+
+use v5.42;
+
+my $sum;
+for my ($x, $y) (<> =~ /\d+/g) {
+       for ($x .. $y) {
+               $sum += $_ if /^(\d+)\1+$/;
+       }
+}
+say $sum;