Python regex to get values from keys:

Question

I would like to get specific data values based on a match for a specific ID which is not sorted and could be anywhere in the line. Here is an example:

[ROUTE:10:23:191:271:3:81]
     route_protocol = ripv2
     dhcp_enabled = yes
     route_config = dynamic

How can I get the route_protocol value only for ROUTE IDs: 23 and 81?

You could use a str method, .split(':'), and grab the values at the indices you want. — ryugie
– ryugie, Commented Jun 9, 2017 at 19:33
Hi Jon, the file is a text file with a config on that format. So I need to create a regular expression that: 1) find the [ROUTE\: 2) then the ID (for example: 23) 3) then if that is found, I want to get the route_protocol = data [ROUTE:{ID}] value = data — squid22
– squid22, Commented Jun 9, 2017 at 19:38

syntaxError · Accepted Answer · 2017-06-09 21:43:07Z

1

This will return the values in a list in order of appearance.

with open('conftxt.txt') as config:
    l = [x for x in config.readlines() if 'route_config' in x]
    route_config_vals = [x.strip().split(' = ')[1] for x in l]

print(route_config_vals) #['dynamic']

EDIT

def extract_values(param: "str paramaeter to search for",
                   ) -> "dict:  ROUTE: param pairs":


  with open('conftxt.txt') as config:
        parameter_list = []

        # get list of parameters
        l = [x for x in config.readlines() if param in x]
        parameter_list= [x.strip().split(' = ')[1] for x in l]

        config.seek(0)  #back to top of file

        # get list of routes
        route_list = [x.strip() for x in config.readlines() if 'ROUTE' in x]
        pairs = {k: v for k, v in zip(route_list, parameter_list)}
        return pairs


print(extract_values('route_config'))  #{'[ROUTE:10:23:191:271:3:81]': dynamic'}
print(extract_values('dhcp_enabled'))  #{'[ROUTE:10:23:191:271:3:81]': 'yes'}

edited Jun 9, 2017 at 21:43

answered Jun 9, 2017 at 19:48

syntaxError

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5 Comments

squid22 Over a year ago

I will try this :) Thank you!

syntaxError Over a year ago

No prob. Are you wanting the route in squared brackets to be mapped to it's route_config value?

squid22 Over a year ago

The thing with the file is that there can be other route_configs: [ROUTE:10:23:191:271:3:81] route_protocol = ripv2 dhcp_enabled = yes route_config = dynamic [ROUTE:99:123] ` route_protocol = ospf` dhcp_enabled = no route_config = dynamic

squid22 Over a year ago

My goal is to be able to say: print "Network {} is configured as: {}".format(id, route_config)

syntaxError Over a year ago

Check my edit, Its' designed so you can specify a parameter to search for an it will iterate through the file and make a dictionary of route: parameter_value pairs. You can then just iterate through the dictionary and do what you need with it.

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