CODEWITHSUNDEEP
regexbisonflex-lexer
Pankaj Goyal
Pankaj Goyal

Reputation: 1548

How to validate a list of ipv4 addresses using flex and bison?

The regex which I am using to validate an IPv4 address is as follows:

dec_octet   [0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]
IPv4Address {dec_octet}\.{dec_octet}\.{dec_octet}\.{dec_octet}
%%
{IPv4Address}  { /* return the value */ }

Now I want to validate a list of ipv4 addresses. It would be good if the same regex can be reused. A Sample input:

ip=(1.1.1.1,2.2.2.2,3.3.3.3)

The delimiters can be anything except brackets or commas. Any help would be appreciated !!

Upvotes: 0

Views: 746

Answers (1)

avim
avim

Reputation: 1019

Say IPV4 is the token lex returns for a valid IPv4 address, add those rules in parser file:

ipv4vector:
    "ip" '='  '(' ipv4list ')' 
ipv4list:
    IPV4 | ipv4list ',' IPV4

Upvotes: 2

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