diff --git a/examples/advent_of_code/2022/day3a.mers b/examples/advent_of_code/2022/day3a.mers
new file mode 100644
index 0000000..a5dca6d
--- /dev/null
+++ b/examples/advent_of_code/2022/day3a.mers
@@ -0,0 +1,24 @@
+input := fs_read("/tmp/pin.txt").assume_no_enum().bytes_to_string().assume_no_enum()
+
+fn prio(s string) {
+    switch! "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".index_of(s) {
+        [] [] 0
+        int n n + 1
+    }
+}
+
+sum := 0
+for line input.regex(".*").assume_no_enum() {
+    left := line.substring(0, line.len() / 2)
+    right := line.substring(line.len() / 2)
+    for ch right.regex(".").assume_no_enum() {
+        if left.contains(ch) {
+            &sum = sum + prio(ch)
+            true
+        }
+    }
+    []
+}
+
+println("sum: " + sum.to_string())
+
diff --git a/examples/advent_of_code/2022/day3b.mers b/examples/advent_of_code/2022/day3b.mers
new file mode 100644
index 0000000..f0e00fe
--- /dev/null
+++ b/examples/advent_of_code/2022/day3b.mers
@@ -0,0 +1,32 @@
+input := fs_read("/tmp/pin.txt").assume_no_enum().bytes_to_string().assume_no_enum()
+
+fn prio(s string) {
+    switch! "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".index_of(s) {
+        [] [] 0
+        int n n + 1
+    }
+}
+
+sum := 0
+for group input.regex(".*\\n.*\\n.*\\n?").assume_no_enum() {
+    rucksacks := group.regex(".*").assume_no_enum()
+    a := rucksacks.get(0).assume1()
+    b := rucksacks.get(1).assume1()
+    c := rucksacks.get(2).assume1()
+    println(a)
+    println(b)
+    println(c)
+    println("---")
+    badge_type := for ch "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".regex(".").assume_no_enum() {
+        if a.contains(ch) && b.contains(ch) && c.contains(ch) {
+            ch
+        }
+    }
+    switch! badge_type {
+        string s &sum = sum + prio(s)
+        [] [] []
+    }
+}
+
+println("sum: " + sum.to_string())
+
diff --git a/examples/advent_of_code/2022/day4a.mers b/examples/advent_of_code/2022/day4a.mers
new file mode 100644
index 0000000..fdb35f5
--- /dev/null
+++ b/examples/advent_of_code/2022/day4a.mers
@@ -0,0 +1,21 @@
+input := fs_read("/tmp/pin.txt").assume_no_enum().bytes_to_string().assume_no_enum()
+
+fn get_pair(s string) {
+    list := s.regex("[^-]+").assume_no_enum()
+    [
+        list.get(0).assume1("A").parse_int().assume1("a")
+        list.get(1).assume1("B").parse_int().assume1("b")
+    ]
+}
+
+count := 0
+for pair input.regex(".+").assume_no_enum() {
+    s := pair.regex("[^,]*").assume_no_enum()
+    s1 := get_pair(s.get(0).assume1("bb"))
+    s2 := get_pair(s.get(1).assume1("aa"))
+    if { s1.0 <= s2.0 && s1.1 >= s2.1 } || { s1.0 >= s2.0 && s1.1 <= s2.1 } {
+        &count = count + 1
+    }
+}
+
+println("count: " + count.to_string())
diff --git a/examples/advent_of_code/2022/day4b.mers b/examples/advent_of_code/2022/day4b.mers
new file mode 100644
index 0000000..c879f6a
--- /dev/null
+++ b/examples/advent_of_code/2022/day4b.mers
@@ -0,0 +1,29 @@
+input := fs_read("/tmp/pin.txt").assume_no_enum().bytes_to_string().assume_no_enum()
+
+fn get_pair(s string) {
+    list := s.regex("[^-]+").assume_no_enum()
+    [
+        list.get(0).assume1().parse_int().assume1()
+        list.get(1).assume1().parse_int().assume1()
+    ]
+}
+
+count := 0
+for pair input.regex(".+").assume_no_enum() {
+    s := pair.regex("[^,]*").assume_no_enum()
+    s1 := get_pair(s.get(0).assume1())
+    s2 := get_pair(s.get(1).assume1())
+    if {
+        s1.0 <= s2.0 && s2.0 <= s1.1
+    } || {
+        s1.0 <= s2.1 && s2.1 <= s1.1
+    } || {
+        s2.0 <= s1.0 && s1.0 <= s2.1
+    } || {
+        s2.0 <= s1.1 && s1.1 <= s2.1
+    } {
+        &count = count + 1
+    }
+}
+
+println("count: " + count.to_string())