正则表达式仅匹配完全匹配而不匹配组

Question

I am using re.findall in python to match each line of a log file and extract the json data from that line. Here is an example line:

<134>1 2017-01-23T10:54:47.111-01:11 bla blabla  - -  <-- '{"jsondata": "1.0", "result": null, "id": 0}'

And the code I'm using on it:

 for line in jsonlog:
        json_marker = "<-- '{"
        if json_marker in line:
            #Extract whats between the single quotes on lines where a json is present
            x = re.findall(r"(\'\{(.*?)\}\')", line)

That returns this (yes there are two):

[('\'{"jsondata": "1.0", "result": null, "id": 0}\'', '"jsondata": "1.0", "result": null, "id": 0')]

But I need it to return just the json data from that line in json format :

{"jsonrpc": "2.0", "result": null, "id": 2530}

When I put my regex into regex101,

\'\{(.*?)\}\' 

I get a group match for

"jsondata": "1.0", "result": null, "id": 0

and full match for

'{"jsondata": "1.0", "result": null, "id": 0}'

So this tells me findall is returning the group. How can I fix this to return the full match, the json object?

Answer 1

Try using this regular expression:

r"({.*?})"

This should take all content within the "{ ... }"s

log_line = 'sdgfjk fgkglhdfg <-- fdfsd dsdasds {"jsondata": "1.0", "result":  null, "id": 0} dasdsad khfsldfg'

print(re.findall(r"({.*?})", log_line))

Here's my output:

['{"jsondata": "1.0", "result": null, "id": 0}']