Extracting a particular URL from a large text file using Python

I am trying to extract a particular URL from a large text file.

Data (or text file):

[{"profile":"164","width":638,"height":360,"mime":"video/mp4","fps":30,"url":"https://vod-progressive.akamaized.net/exp=1685291596~acl=%2Fvimeo-transcode-storage-prod-us-central1-h264-360p2F3314456635875455007.mp4~hmac=938482df34b6c94756876549908053d738d426ca/vimeo-transcode-storage-prod-us-central1-h264-360p/01/2982/28/714910924/3314655007.mp4","cdn":"akamai_interconnect","quality":"360p","id":"a81ee7e1-4ae0-4b3a-85fe-7d0d8ff16b93","origin":"gcs"},{"profile":"165","width":958,"height":540,"mime":"video/mp4","fps":30,"url":"https://vod-progressive.akamaized.net/exp=1685291596~acl=%2Fvimeo-transcode-storage-prod-us-west1-h264-540p%2F01%2F2982%2F28%2F714910924%2F3314655137.mp4~hmac=938482df31237894b6c947e9908053d738d4dd26ca/vimeo-transcode-storage-prod-us-west1-h264-540p/01/2982/28/714910924/3314655137.mp4","cdn":"akamai_interconnect","quality":"540p","id":"08b0edbf-ce47-4dd1-aa17-3c14ed3eccc8","origin":"gcs"},{"profile":"174","width":1278,"height":720,"mime":"video/mp4","fps":30,"url":"https://vod-progressive.akamaized.net/exp=1685291596~acl=%2Fvimeo-transcode-storage-prod-us-east1-h264-720p%2F01%FFF2F2F22F3314655135.mp4~hmac=c44e0c048f008ce4996434ce5d6543234567189dbc63/vimeo-transcode-storage-prod-us-east1-h264-720p/01/2982/28/714910924/3314655135.mp4","cdn":"akamai_interconnect","quality":"720p","id":"625db5ed-2175-4977-a562-de40d84aab45","origin":"gcs"}]},"file_codecs":{"av1":[],"avc":["a81ee7e1-4ae0-4b3a-85fe-7d0d8ff16b93","d5589a0c-a69a-4428-ad7e-0c2a1e4e9f92","08b0edbf-ce47-4dd1-aa17-3c14ed3eccc8","625db5ed-2175-4977-a562-de40d84aab45"],"hevc":{"dvh1":[],"hdr":[],"sdr":[]}},"lang":"en","referrer"

Here's the same text that can be viewed using an online text viewer. and here's an image of the part that I am trying to extract:

Description of the problem:

• There are several links in the text document, including links that look similar (not same) to the one that I am trying to extract. The only link (from the txt file) that I need to extract contains 720p somewhere in it.

• The URL looks like "https://vod-progressive.akamaized.net [..] .mp4".

• Do note, so that we don't end up getting only a subset of the desired link, that the link contains a .mp4 once inside and once in the end. That is, it looks like "https://vod-progressive.akamaized.net [..] .mp4~hmac= [..] .mp4" as you should be able to see in the highlighted text in the image attached.

The following code extracts all the urls but only partially:

text_string = ""
with open("text.txt", "r") as text_file:
    text_string = text_file.read()

urls = re.findall('http
展开收缩
?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*(),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+', text_string)

print(urls)

It prints the following: ['https://vod-progressive.akamaized.net/exp=1685291596', 'https://vod-progressive.akamaized.net/exp=1685291596', 'https://vod-progressive.akamaized.net/exp=1685291596']

Modifications needed to the code:

1. The links are not fully obtained. Only the initial part of it is obtained.
2. Not every link is needed. The desired link is described under "Description of the Problem".

import json

data = json.loads(json_str)
data["url"]

The url that you want can be retrieved by data["url"]