How to find string with readfile if we know only a part of the string?

Question

How can I find a string in a text file if I know only the part of the string? For example, I know only ".someserver.com"

But the whole text in the file looks like the following:

"hostname1.expedite.someserver.com"

So the point is to find the whole name by knowing only a part of it.

part of the file content:

{"attributes": {"meta_data": {"created_at":1614882362.179626, "created_by": "admin"}, "site": "AF002"}, hostname:"hostname1.expedite.someserver.com",

Answer 1

Assuming your data looks like:

{"attributes": "xyz", "hostname": ":hostname1.expedite.someserver.com"}
{"attributes": "xyz", "hostname": ":hostname1.expedite.another.com"}
{"attributes": "xyz", "hostname": ":hostname1.expedite.server.com"}
{"attributes": "xyz", "hostname": ":hostname1.expedite.we.com"}
{"attributes": "xyz", "hostname": ":hostname1.expedite.dont.com"}
{"attributes": "xyz", "hostname": ":hostname1.expedite.care.com"}

We can:

import ast

check = ".someserver.com"

with open("string.txt", "r") as f:
    line = f.readline()
    while line:
        if check in line:
            print(dict(ast.literal_eval(line))["hostname"])
        line = f.readline()

this prints us:

:hostname1.expedite.someserver.com

---

Assuming the data looks like:

[{"attributes": "xyz", "hostname": ":hostname1.expedite.someserver.com"}, {"attributes": "xyz", "hostname": ":hostname1.expedite.another.com"}, {"attributes": "xyz", "hostname": ":hostname1.expedite.server.com"}, {"attributes": "xyz", "hostname": ":hostname1.expedite.we.com"}, {"attributes": "xyz", "hostname": ":hostname1.expedite.dont.com"}, {"attributes": "xyz", "hostname": ":hostname1.expedite.care.com"}]

We then can:

import json

check = ".someserver.com"

data = json.load(open("string2.txt", "r"))
for d in data:
    if check in d["hostname"]:
        print(d["hostname"])

This gives us:

:hostname1.expedite.someserver.com