Valid Phone Numbers LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Valid Phone Numbers in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the Problem – Valid Phone Numbers– LeetCode Problem

Valid Phone Numbers– LeetCode Problem

Problem:

Given a text file file.txt that contains a list of phone numbers (one per line), write a one-liner bash script to print all valid phone numbers.

You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)

You may also assume each line in the text file must not contain leading or trailing white spaces.

Example:

Assume that file.txt has the following content:

987-123-4567
123 456 7890
(123) 456-7890

Your script should output the following valid phone numbers:

987-123-4567
(123) 456-7890

Valid Phone Numbers– LeetCode Solutions

First Problem solution.

#!/usr/bin/env bash

while read line; do
    if [[ "$line" =~ ^((\([0-9]{3}\) )|[0-9]{3}-)[0-9]{3}-[0-9]{4}$ ]]; then
        echo $line
    fi
done < "file.txt"

Second Problem solution.

grep '[(\d)]{3,5}[ -]?\d{3}-\d{4}$' file.txt

Third Problem solution.

grep -e "^[0-9]\{3\}-[0-9]\{3\}-[0-9]\{4\}$" -e "^([0-9]\{3\}) [0-9]\{3\}-[0-9]\{4\}$" file.txt