parsing some values from string in nodeJS

Question

What's the best way in nodeJS to parse to following string to extract values described below?

client 111.222.333.44#59699: query: jadssdffsdnisa.website.com IN A -ED (81.11.11.175)

Current code:

//parsing
var c_ip = data.split("client ")[1].split("#")[0] 
var sdomain  = data.split("query:")[1].split(".")[0]  

console.log("c_ip: " + c_ip + '\n');    
console.log("sdomain: " + sdomain + '\n');

Results in:

c_ip: 130.225.244.66

sdomain:  paul

What assumptions can be made towards the length of c_ip and the structure of the query? — Jens Habegger
– Jens Habegger, Commented Jul 5, 2016 at 8:10

arc · Accepted Answer · 2016-07-05 09:24:33Z

2

This very depends on how your input string arrives but assuming that it has always that same format you could do something like this

var task = "client 111.222.333.44#59699: query: jadssdffsdnisa.website.com IN A -ED (81.11.11.175)"

var c_ip = task.split("client ")[1].split("#")[0]
var sdomain  = task.split("query: ")[1].split(".")[0] 

console.log("c_ip:", c_ip)
console.log("sdomain:", sdomain)

further, if it varies more you could use regex. @jens-habegger has a good example

edited Jul 5, 2016 at 9:24

answered Jul 5, 2016 at 8:27

arc

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3 Comments

peke_peke Over a year ago

It won't varietes that much. Using your code there seems to be some whitespaces before the subdomain aren't they? I've edited first post.

Jens Habegger Over a year ago

This is probably faster than my answer using regex.

arc Over a year ago

@peke_peke indeed. query: needed an additional space at the end. it works now. The space that still remains is based on the console.log() function

Jens Habegger · Accepted Answer · 2016-07-05 08:26:07Z

0

Use basic regex:

var string = "client 111.222.333.44#59699: query: jadssdffsdnisa.website.com IN A -ED (81.11.11.175)"

var c_ip_reg = /client\s(.*)#/;
var c_ip = string.match(c_ip_reg);

var sdomain_ref = /query:\s(.*?)\/;
var sdomain = string.match(sdomain_ref);

I'm aware this can be shortened into a multi-group match, but for the sake of readability I tried to be as verbose as possible.

.

answered Jul 5, 2016 at 8:26

Jens Habegger

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