## Validating phone numbers Hackerrank solution

Let’s dive into the interesting topic of regular expressions! You are given some input, and you are required to check whether they are valid mobile numbers.

A valid mobile number is a ten digit number starting with a 7,8 or 9.

**Concept**

A valid mobile number is a ten digit number starting with a 7,8 or 9.

Regular expressions are a key concept in any programming language. A quick explanation with Python examples is available here. You could also go through the link below to read more about regular expressions in Python.

https://developers.google.com/edu/python/regular-expressions

**Input Format**

The first line contains an integer N, the number of inputs.

N lines follow, each containing some string.

**Constraints**

1<=N<=10

2<=len(Number)<=15

**Output Format**

For every string listed, print “*YES*” if it is a valid mobile number and “*NO*” if it is not on separate lines. Do not print the quotes.

**Sample Input**

2 9587456281 1252478965

**Sample Output**

YES NO

Code:

#Validating phone numbers import re N=int(input()) for i in range(N): if re.match(r'^[789]\d{9}$',input()): print("YES") else: print("NO") #Validating phone numbers

Disclaimer: This problem is originally created and published by HackerRank, we only provide solutions to this problem. Hence, doesn’t guarantee the truthfulness of the problem. This is only for information purposes.