是否有任何 python 方法能够在长字符串中提取 [ ] 符号之间的键值？

Question

I am using geodjango,and i would extract the value of "EPSG" from the long string returned from a code as below:

PROJCS["WGS_1984_UTM_Zone_42N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326 "]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meri dian",69],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1],AXIS["Easting",EAST],AXIS["Northing",NORTH]] crs_name

Answer 1

You can use regular expressions

import re

text = '''PROJCS["WGS_1984_UTM_Zone_42N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326 "]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meri dian",69],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1],AXIS["Easting",EAST],AXIS["Northing",NORTH]] crs_name'''
lst = re.findall(r'\["EPSG","(\d+)', text)
print(lst)

Prints:

['7030', '6326']