Validate the segment using the standard IPv4 rules.

First reject empty strings and strings containing non-digit characters. Then reject segments with more than one character that start with 0, because leading zeros are not allowed.

Finally, convert the segment to a number and check whether it is between 0 and 255.

Pseudocode:

function validateIpSegmentSimple(segment):
    if segment is empty:
        return false
    if segment contains any non-digit character:
        return false
    if length(segment) > 1 and segment[0] == '0':
        return false
    value = convert segment to integer
    return value >= 0 and value <= 255