valid-palindrome solution

Author: mintheon

valid-palindrome/mintheon.java

@@ -0,0 +1,27 @@
+class Solution {
+  public boolean isPalindrome(String s) {
+    int start = 0;
+    int end = s.length() - 1;
+
+    while(start < end) {
+      if(!Character.isLetterOrDigit(s.charAt(start))) {
+        start++;
+        continue;
+      }
+
+      if(!Character.isLetterOrDigit(s.charAt(end))){
+        end--;
+        continue;
+      }
+
+      if(Character.toLowerCase(s.charAt(start)) != Character.toLowerCase(s.charAt(end))) {
+        return false;
+      }
+
+      start++;
+      end--;
+    }
+
+    return true;
+  }
+}