Day 7: Regular Expressions II Solution
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Day 7: Regular Expressions II Solution
Task
Complete the function in the editor below by returning a RegExp object, re, that matches any string s satisfying both of the following conditions:
- String s starts with the prefix Mr., Mrs., Ms., Dr., or Er.
- The remainder of string s (i.e., the rest of the string after the prefix) consists of one or more upper and/or lowercase English alphabetic letters (i.e., [a-z] and [A-Z]).
Constraints
- The length of string s is =>3.
Output Format
The function must return a RegExp object that matches any string s satisfying both of the given conditions.
Sample Input 0
Mr.X
Sample Output 0
true
Explanation 0
This string starts with Mr., followed by an English alphabetic letter (X).
Sample Input 1
Mrs.Y
Sample Output 1
true
Explanation 1
This string starts with Mrs., followed by an English alphabetic letter (Y).
Sample Input 2
Dr#Joseph
Sample Output 2
false
Explanation 2
This string starts with Dr# instead of Dr., so it’s invalid.
Sample Input 3
Er .Abc
Sample Output 3
false
Explanation 3
This string starts with Er but there is a space before the period (.), making the string invalid.
Solution – Day 7: Regular Expressions II
'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 with 'Mr.', 'Mrs.', 'Ms.', 'Dr.', or 'Er.',
* followed by one or more letters.
*/
let re = /^(Mr|Mrs|Ms|Dr|Er)(\.)([a-zA-Z])+$/;
/*
* Do not remove the return statement
*/
return re;
}
function main() {
const re = regexVar();
const s = readLine();
console.log(!!s.match(re));
}