Day 7: Regular Expressions I Solution
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Day 7: Regular Expressions I Solution
Objective
In this challenge, we use a Regular Expression to evaluate a string.
Task
Complete the function in the editor below by returning a RegExp object, re, that matches any string s that begins and ends with the same vowel. Recall that the English vowels are a, e, i, o, and u.
Constraints
- The length of string s is =>3 .
- String s consists of lowercase letters only (i.e., [a-z]).
Output Format
The function must return a RegExp object that matches any string s beginning with and ending in the same vowel.
Sample Input 0
bcd
Sample Output 0
false
Explanation 0
This string starts with (and ends in) a consonant, so it cannot start and end with the same vowel.
Sample Input 1
abcd
Sample Output 1
false
Explanation 1
This string ends in a consonant, so it cannot start and end with the same vowel.
Sample Input 2
abcda
Sample Output 2
true
Explanation 2
This string starts and ends with the same vowel (a).
Sample Input 3
abcdo
Sample Output 3
false
Explanation 3
This string starts with the vowel a but ends in the vowel o.
Solution – Day 7: Regular Expressions I
'use strict';
process.stdin.resume();
process.stdin.setEncoding('utf-8');
let inputString = '';
let currentLine = 0;
process.stdin.on('data', inputStdin => {
inputString += inputStdin;
});
process.stdin.on('end', _ => {
inputString = inputString.trim().split('\n').map(string => {
return string.trim();
});
main();
});
function readLine() {
return inputString[currentLine++];
}
function regexVar() {
/*
* Declare a RegExp object variable named 're'
* It must match a string that starts and ends with the same vowel (i.e., {a, e, i, o, u})
*/
var re = RegExp(/^([aeiou]).*\1$/);
/*
* Do not remove the return statement
*/
return re;
}
function main() {
const re = regexVar();
const s = readLine();
console.log(re.test(s));
}