Validating an IP with regex

Question

I need to validate an IP range that is in format 000000000 to 255255255 without any delimiters between the 3 groups of numbers. Each of the three groups that the final IP c

Answer 1

for match exclusively a valid IP adress use

(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}

instead of

([01]?[0-9][0-9]?|2[0-4][0-9]|25[0-5])(([01]?[0-9][0-9]?|2[0-4][0-9]|25[0-5])){3}

because many regex engine match the first possibility in the OR sequence

you can try your regex engine with : 10.48.0.200