C++ Regular Expressions with Boost Regex

Question

I am trying to take a string in C++ and find all IP addresses contained inside, and put them into a new vector string.

I\'ve read a lot of documentation on regex, b

Answer 1

The offered solution is quite good, thanks for it. Though I found a slight mistake in the pattern itself.

For example, something like 49.000.00.01 would be taken as a valid IPv4 address and from my understanding, it shouldn't be (just happened to me during some dump processing).

I suggest to improve the patter into:

"\\b(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)"
"\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)"
"\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)"
"\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\\b";

This should allow only 0.0.0.0 as the all-zero-in, which I suppose to be correct and it will eliminate all .00. .000. etc.