正则表达式替换无法用正则表达式变量替换 Python

Question

we have huge number of files where we need to transfrom to json here is the sampple data of one file

{
1=2,
4=tt,
6=9
}
{
1=gg,
2=bd,
6=bb
}

I am using python to convert the data where regex expression is working fine but the same regex is not working when i implementing in python code here is the code

import numpy as np
f = open('/Users/rahulvarma/Downloads/2020120911.txt', 'r')
content = f.read()
import re
regex = r"([0-9]+)(=)((.*)+)"
subst = "\"$1\":\"$3\","
result = re.sub(regex, subst, content,  0, re.MULTILINE)

if result:
    print (result)

but my were

{
"$1":"$3",
"$1":"$3",
"$1":"$3"
}
{
"$1":"$3",
"$1":"$3",
"$1":"$3"
}

my expected output should be

{
"1":"2",
"4":"tt",
"6":"9"
}
{
"1":"gg",
"2":"bd",
"6":"bb"
}

Answer 1

You can search using this regex:

(\d+)=([^,\n]*)(,|$)

And replace using:

"\1":"\2"\3

RegEx Demo

Code:

regex = r"(\d+)=([^,\n]*)(,|$)"

result = re.sub(regex, r'"\1":"\2"\3', input_str, 0, re.MULTILINE)

RegEx Details:

• (\d+) : Match 1+ digits in captured group #1
• = : Match = character
• ([^,\n]*) : Match 0 or more of any characters that are not , and not \n in captured group #2
• (,|$) : Match comma or end of line in captured group #3