Validating Email Adresses With a Filter python
Problem Statement :
You are given an integer N followed by N email addresses. Your task is to print a list containing only valid email addresses in lexicographical order. Valid email addresses must follow these rules: It must have the username@websitename.extension format type. The username can only contain letters, digits, dashes and underscores. The website name can only have letters and digits. The maximum length of the extension is 3. Concept A filter takes a function returning True or False and applies it to a sequence, returning a list of only those members of the sequence where the function returned True. A Lambda function can be used with filters. Let's say you have to make a list of the squares of integers from 0 to 9 (both included). >> l = list(range(10)) >> l = list(map(lambda x:x*x, l)) Now, you only require those elements that are greater than 10 but less than 80. >> l = list(filter(lambda x: x > 10 and x < 80, l)) Easy, isn't it? Input Format The first line of input is the integer N, the number of email addresses. N lines follow, each containing a string. Constraints Each line is a non-empty string. Output Format Output a list containing the valid email addresses in lexicographical order. If the list is empty, just output an empty list, [].
Solution :
Solution in C :
import sys, re
n = int(input())
a = [input() for i in range(n)]
print(sorted([s.strip() for s in a if re.match(r'^[a-zA-Z0-9_-]+@[a-zA-Z0-9]+\.[a-zA-Z0-9]{1,3}$', s)]))
View More Similar Problems
Dynamic Array
Create a list, seqList, of n empty sequences, where each sequence is indexed from 0 to n-1. The elements within each of the n sequences also use 0-indexing. Create an integer, lastAnswer, and initialize it to 0. There are 2 types of queries that can be performed on the list of sequences: 1. Query: 1 x y a. Find the sequence, seq, at index ((x xor lastAnswer)%n) in seqList.
View Solution →Left Rotation
A left rotation operation on an array of size n shifts each of the array's elements 1 unit to the left. Given an integer, d, rotate the array that many steps left and return the result. Example: d=2 arr=[1,2,3,4,5] After 2 rotations, arr'=[3,4,5,1,2]. Function Description: Complete the rotateLeft function in the editor below. rotateLeft has the following parameters: 1. int d
View Solution →Sparse Arrays
There is a collection of input strings and a collection of query strings. For each query string, determine how many times it occurs in the list of input strings. Return an array of the results. Example: strings=['ab', 'ab', 'abc'] queries=['ab', 'abc', 'bc'] There are instances of 'ab', 1 of 'abc' and 0 of 'bc'. For each query, add an element to the return array, results=[2,1,0]. Fun
View Solution →Array Manipulation
Starting with a 1-indexed array of zeros and a list of operations, for each operation add a value to each of the array element between two given indices, inclusive. Once all operations have been performed, return the maximum value in the array. Example: n=10 queries=[[1,5,3], [4,8,7], [6,9,1]] Queries are interpreted as follows: a b k 1 5 3 4 8 7 6 9 1 Add the valu
View Solution →Print the Elements of a Linked List
This is an to practice traversing a linked list. Given a pointer to the head node of a linked list, print each node's data element, one per line. If the head pointer is null (indicating the list is empty), there is nothing to print. Function Description: Complete the printLinkedList function in the editor below. printLinkedList has the following parameter(s): 1.SinglyLinkedListNode
View Solution →Insert a Node at the Tail of a Linked List
You are given the pointer to the head node of a linked list and an integer to add to the list. Create a new node with the given integer. Insert this node at the tail of the linked list and return the head node of the linked list formed after inserting this new node. The given head pointer may be null, meaning that the initial list is empty. Input Format: You have to complete the SinglyLink
View Solution →