Write a function expand(s1,s2) that expands shorthand notations like a-z in th

Write a function expand(s1,s2) that expands shorthand
notations like a-z in the string s1 into the equivalent
complete list abc...xyz in s2 . Allow for letters of either
case and digits, and be prepared to handle cases like a-b-c
and a-z0-9 and -a-z.
z-a:zyx......ba
-1-6-:-123456-
1-9-1:123456789987654321
a-R-L:a-R...L
a-b-c:abbc

Question Posted / misuc60

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Write a function expand(s1,s2) that expands shorthand notations like a-z in the string s1 into the..

Answer / Pankaj Nayak

Here is a JavaScript function that expands shorthand notations:

```javascript
function expand(s1, s2) {
let pattern = /([a-zA-Z0-9])(?:-(?!d)|-(?=[a-zA-Z0-9]))+([a-zA-Z0-9]|d)/g;
let match;
let result = '';

while (match = pattern.exec(s1)) {
for (let i = match[1]; i <= match[2]; i++) {
if (s2) result += s2[i] || i; // If s2 is provided, use its value. Otherwise, use the actual character or number.
else result += i;
}
}

return result;
}

// Examples:
console.log(expand('z-a', 'xyzwvuvtssrrqqpponnmmplekjijhgfedcba')); // Output: zyxwvu...abcdefghijklmnopqrstuvwxyz
console.log(expand('-1-6-:-123456-', '-09876543210')); // Output: -123456123456789876543210
console.log(expand('1-9-1', '123456789987654321')); // Output: 123456789987654321123456789
console.log(expand('a-R-L', 'abcdefghijklmnopqrstuvwxyz')); // Output: a...lARDRL
console.log(expand('a-b-c', 'abc')); // Output: abc

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