How to match multiple strings using regular expression?

Question

I have a bunch of strings to match for Bonfire: Palindrome in FreeCodeCamp The strings are:

• eye
• racecar
• not a palindrome
• A man, a plan, a canal. Panama
• nope
• almostomla
• My age is 0, 0 si ega ym.
• 1 eye for of 1 eye.
• 0_0 (: /-\ :) 0-0

My Code:

function palindrome(str) {


  var newstr = str.replace(/[^\w_-]/g,"").toLowerCase();
  var num = newstr.length;
  for(var i=0;i<=Math.floor(num/2);i++)  
    {
      if(newstr[i]!==newstr[num-i])
        {

          return newstr;

       }
    }

  return true;
}

What could be wrong in the if statement? the return of the string is alright.. Just can't wrap my head around these Regular expressions?

My current regular expression:

var newstr = str.replace(/[^\w_-]/g,"").toLowerCase();

matches almost all the strings but the last one. Where am I going wrong?

Answer 1

So while the answers were useful, they did not provide a correct regular expression. Shoot out to @Barmar for pointing at the right direction. This is my regular expression.

var newstr = str.replace(/[\W_]/g,'').toLowerCase();

The full code for Palindrome in FCC:

function palindrome(str) {


  var newstr = str.replace(/[\W_]/g,'').toLowerCase();
  var num = newstr.length;
  for(var i=0;i<=Math.floor(num/2);i++)  
    {
      if(newstr[i]!==newstr[num-1-i])
        {

          return false;

       }
    }

  return true;
}



palindrome("0_0 (: /-\ :) 0-0");