Python String Extraction from text file -

i have written python script make call server , fetch response. while making call server, pass few values in body of request. value supposed fetched reading text file. text file sample given below.

my text file sample:

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host: localhost:8080 connection: keep-alive ..... ..... {"token":"abcdefhutryskslkslksslslks=="}post /fill/entry/login http/1.1  host: localhost:8080 connection: keep-alive ..... ..... {"value":"abcdefghijklmnopqrstuvwxyz",  "pass":"123456789zxcvbnmljhgfds",  "token":"abcdefghijklmnopqrstuvwxyz=="}post /fill/health http/1.1 

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here, if can observe, different responses. need capture string starts {"value" , ends "} (the second part of response seen in sample).

on searching in stack overflow, came across scenarios extract string have definite start point , definite end point. in case, though start point can identified uniquely using search string " {"url ", end point cannot identified text file contains multiple other parentheses well.

any suggestions/pointers on fetching specific part of sting text file(as stated above) helpful.

a re example interpreter:

>>> open('file') f: ...    raw = f.read() >>>  >>> import re >>> pat = re.compile(r'{"value":[^{]+}') >>> pat.findall(raw) ['{"value":"abcdefghijklmnopqrstuvwxyz",\n "pass":"123456789zxcvbnmljhgfds",\n "token":"abcdefghijklmnopqrstuvwxyz=="}'] >>> pat.search(raw).group() '{"value":"abcdefghijklmnopqrstuvwxyz",\n "pass":"123456789zxcvbnmljhgfds",\n "token":"abcdefghijklmnopqrstuvwxyz=="}'