diff --git a/lib/anchor_end.js b/lib/anchor_end.js
index 56e8b85..8b431bd 100644
--- a/lib/anchor_end.js
+++ b/lib/anchor_end.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TOOD
-}
\ No newline at end of file
+  var regx=/BANANAS$/;
+  return regx.test(str);
+}
diff --git a/lib/anchor_start.js b/lib/anchor_start.js
index 56e8b85..0088abd 100644
--- a/lib/anchor_start.js
+++ b/lib/anchor_start.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TOOD
-}
\ No newline at end of file
+  var regx=/^LITERALLY/;
+  return regx.test(str);
+}
diff --git a/lib/char_class.js b/lib/char_class.js
index a08ee57..eb8529a 100644
--- a/lib/char_class.js
+++ b/lib/char_class.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var regx=/^(a|\d|u|o)/;
+  return regx.test(str);
+}
diff --git a/lib/negated_char_class.js b/lib/negated_char_class.js
index a08ee57..866e720 100644
--- a/lib/negated_char_class.js
+++ b/lib/negated_char_class.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var regx=/^\D[^A-Z]/;
+  return regx.test(str);
+}