@LEFT[n,string] : If n is positive, it returns the leftmost n characters of string. If n is greater than the length of string, it returns the entire string. If n is negative, it returns string after dropping its rightmost n characters, unless -n is greater than the length of string, in which case it returns an empty string.
Examples:
echo %@LEFT[2,jpsoft]
jp |
echo %@LEFT[22,jpsoft]
jpsoft
echo %@LEFT[-2,jpsoft]
jpso
echo "%@LEFT[-22,jpsoft]"
""