如何用re库匹配键值对，或者直接提取键值对key所对应的value。

Question

匹配出"mp4_ld_mp4"后边的链接内容试了好久都匹配不出来，求大佬帮忙解决。

"urls": {

"mp4_720p_mp4": "http://f.video.weibocdn.com/002tYBjXgx07C88NcBlJ01041201h6bl0E010.mp4?label=mp4_720p&template=1278x720.25.0&trans_finger=1f0da16358befad33323e3a1b7f95fc9&Expires=1588402699&ssig=BpJWSU5ftK&KID=unistore,video",

"mp4_hd_mp4": "http://f.video.weibocdn.com/004BQvNdgx07C88MJNrq01041200EuR70E010.mp4?label=mp4_hd&template=852x480.25.0&trans_finger=62b30a3f061b162e421008955c73f536&Expires=1588402699&ssig=BwUSLiWtSL&KID=unistore,video",

"mp4_ld_mp4": "http://f.video.weibocdn.com/0023GJskgx07C88MpP4j01041200q7Zv0E010.mp4?label=mp4_ld&template=636x360.25.0&trans_finger=40a32e8439c5409a63ccf853562a60ef&Expires=1588402699&ssig=uKky2HLGBK&KID=unistore,video"

}

Answer 1

https://hiregex.com/r/arYVq/1

代码如下：

import re
str='''"urls": {

"mp4_720p_mp4": "http://f.video.weibocdn.com/002tYBjXgx07C88NcBlJ01041201h6bl0E010.mp4?label=mp4_720p&template=1278x720.25.0&trans_finger=1f0da16358befad33323e3a1b7f95fc9&Expires=1588402699&ssig=BpJWSU5ftK&KID=unistore,video",

"mp4_hd_mp4": "http://f.video.weibocdn.com/004BQvNdgx07C88MJNrq01041200EuR70E010.mp4?label=mp4_hd&template=852x480.25.0&trans_finger=62b30a3f061b162e421008955c73f536&Expires=1588402699&ssig=BwUSLiWtSL&KID=unistore,video",

"mp4_ld_mp4": "http://f.video.weibocdn.com/0023GJskgx07C88MpP4j01041200q7Zv0E010.mp4?label=mp4_ld&template=636x360.25.0&trans_finger=40a32e8439c5409a63ccf853562a60ef&Expires=1588402699&ssig=uKky2HLGBK&KID=unistore,video"

}'''
result=re.search(r'\"mp4_ld_mp4\":\s*\"([^\"]+)\"',str)
if result:
    print(result.group(1))