https://leetcode.com/problems/valid-palindrome/

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/**
 * @param {string} s
 * @return {boolean}
 */
var isPalindrome = function(s) {
    let arr = Array.from(s)
    let p = 0
    let q = arr.length - 1
    while (p <= q) {
        let reg = /[a-zA-Z0-9]/
        if (!reg.test(arr[p])) {
            p++
        } else if (!reg.test(arr[q])) {
            q--
        } else {
            if (arr[p].toLowerCase() !== arr[q].toLowerCase()) {
                return false
            }
            p++
            q--
        }
    }
    return true
};