diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..9a441e4
Binary files /dev/null and b/.DS_Store differ
diff --git a/lib/anchor_end.js b/lib/anchor_end.js
index 56e8b85..9f242ab 100644
--- a/lib/anchor_end.js
+++ b/lib/anchor_end.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TOOD
+  const reg=/BANANAS$/;
+  return reg.test(str);
 }
\ No newline at end of file
diff --git a/lib/anchor_start.js b/lib/anchor_start.js
index 56e8b85..844101f 100644
--- a/lib/anchor_start.js
+++ b/lib/anchor_start.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TOOD
+  const pattern=/^LITERALLY/;
+  return pattern.test(str);
 }
\ No newline at end of file
diff --git a/lib/char_class.js b/lib/char_class.js
index a08ee57..2feb948 100644
--- a/lib/char_class.js
+++ b/lib/char_class.js
@@ -1,3 +1,6 @@
 module.exports = function (str) {
   // TODO
+  // b不行  数字可以 大写不行
+  var reg=/^[auo14]/;
+  return reg.test(str);
 }
\ No newline at end of file
diff --git a/lib/negated_char_class.js b/lib/negated_char_class.js
index a08ee57..4f29686 100644
--- a/lib/negated_char_class.js
+++ b/lib/negated_char_class.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
+  const reg=/^[^0-9][^A-Z]/;
+  return reg.test(str);
 }
\ No newline at end of file