g means global, so instead of matching the first x or first o, it match all the x and o in the string. i meaning case insensitive, it will match both upper case X/O and lower case x/o.

same quastion

g is global checking, so matching for all cases and not the first case
i is for case-insensitive, by default regex is case-sensitive so haveing an i turns off case-sensitive mode

Very nice. I wonder if it's the most efficient in Big O

Copy and paste that in regex101

/x/gi what does the "gi" mean?

i dont understand the code, and ofc i failed the task lol