Valid Palindrome: coding question

Problem

A palindrome is a text that reads the same from left to right and from right to left.

You get a string s. First, change all uppercase letters to lowercase letters. Then remove each character that is not a letter or a digit.

Return true if the result is a palindrome. Return false if it is not. An empty result is a palindrome.

Input:: s = "Step on no pets!"
Output:: true
Explanation:: After the two steps, the text is "steponnopets". It reads the same in both directions.

Input:: s = "Abc, cbx"
Output:: false
Explanation:: After the two steps, the text is "abccbx". The first character is a, but the last character is x.

SysRound wrote this statement. A reference solution checks every example.

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Problem

A palindrome is a text that reads the same from left to right and from right to left.

You get a string s. First, change all uppercase letters to lowercase letters. Then remove each character that is not a letter or a digit.

Return true if the result is a palindrome. Return false if it is not. An empty result is a palindrome.

Input:: s = "Step on no pets!"
Output:: true
Explanation:: After the two steps, the text is "steponnopets". It reads the same in both directions.

Input:: s = "Abc, cbx"
Output:: false
Explanation:: After the two steps, the text is "abccbx". The first character is a, but the last character is x.

SysRound wrote this statement. A reference solution checks every example.