Answer

Author: taduyvinh

Answer.md

@@ -0,0 +1,16 @@
+Homework 1:
+
+Homework 2:
+
+/^[^abek][^gmkb][a-zA-Z]*fe$/
+
+Homework 3:
+
+/^c(?!h)[a-zA-Z]*te$/
+Homework 4:
+
+/^[a-zA-Z]*(sign|ect|sis)+[a-zA-Z]*(?!xt|de|me)$/
+
+Homework 5:
+
+/^[a-zA-Z]*(sign|ect|sis)+(?![a-zA-Z]*(xt|de|me)$)[a-zA-Z]*$/