Python validating sql parser

The examples in antlr need a lot of work to convert to a nice ast in python.

The sql standard grammers are here, but it would be a full time job to convert them yourself and it is likely that you would only need a subset of them i.e no joins.

I was in search of something similar for IPv4 addresses - a regex that also stopped commonly used private ip addresses from being validated (192.168.x.y, 10.x.y.z, 172.16.x.y) so used negative look aheads to accomplish this: (These should be on one line of course, formatted for readability purposes on 3 separate lines) Debuggex Demo It may not be optimised for speed, but works well when only looking for 'real' internet addresses.

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IPv4 address (accurate capture) Matches 0.0.0.0 through 255.255.255.255 Use this regex to match IP numbers with accurracy. I changed that regular expression as follow: const char* ipv4_regex = "\b(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\b"; const char* mcast_ipv4_regex = "\b(22[4-9]|23[0-9])\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]?

Each of the 4 numbers is stored into a capturing group, so you can access them for further processing. )\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\b"; String zero To255 = "([0-9]|[0-9][0-9]|(0|1)[0-9][0-9]|2[0-4][0-9]|25[0-5])"; it can contain single digit i.e ([0-9]); It can contain two digits i.e ([0-9][0-9]); range is (099 to 199)i.e((0|1)[0-9][0-9]); range is (200 - 249) i.e (2[0-9][0-9]) ; range is (250-255) i.e(25[0-5]); def is_valid_ipv4(ip4): """Validates IPv4 addresses.

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