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let input = [
"1-3 a: abcde",
"1-3 b: cdefg",
"2-9 c: ccccccccc"
]
// wrong
// function testpassword(line){
// let [_, lower, upper, char, password] = line.match(/^(\d+)-(\d+)\s(\w):\s(\w+)$/)
// console.log(line, {lower, upper, char, password})
// console.log(`${char}{${lower},${upper}}`, new RegExp(`${char}{${lower},${upper}}`).test(password))
// return new RegExp(`${char}{${lower},${upper}}`).test(password)
// }
function testpassword(line){
let [_, lower, upper, char, password] = line.match(/^(\d+)-(\d+)\s(\w):\s(\w+)$/)
let charcount = password.split("").filter(each => each == char).length
return lower <= charcount && charcount <= upper
}
function testpassword(line){
let [_, lower, upper, char, password] = line.match(/^(\d+)-(\d+)\s(\w):\s(\w+)$/)
let lowerchar = password[+lower - 1] == char
let upperchar = password[+upper - 1] == char
return lowerchar && !upperchar || upperchar && !lowerchar
}
let valid = input
.map(testpassword)
.filter(Boolean)
.length
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