如何使用 re 在变量中找到特定字符串并进行更改？

Question

How can I find a specific string in a variable and change it with regular expressions For example

import re
Variable_To_Change = "This is Variable Number ^NUMBER^"

How can I use RE to find the word ^NUMBER^ and change the variable so that it doesn't say ^NUMBER^ but actual number like "This is Variable Number 1"

Answer 1

why would you use re for this... I dont know but here you go

 re.sub("\^NUMBER\^","1",my_string)

you could just use

 my_string.replace("^NUMBER^",1)

Im now going to make some assumtions

you have a data structure like follows

data = {"NUMBER":1,"STRING":"hello friend","BOOL":True}

and you have a string as follows

my_string = "I have ^NUMBER^ of apples to share with ^STRING^ and this is ^BOOL^"

and you want to substitute in the data from your data dictionary to the string

this can be done with re or string.replace quite easily (If you would have better defined the original question I would have left this to begin with)

# with replace
for key,value in data.items():
    my_string = my_string.replace("^{key}^".format(key=key),str(value))
print(my_string)

# with RE
def match_found(match):
    return data.get(match.group(1),"???UNKNOWN VAR???")
my_string = re.sub("\^([A-Z]+)\^",match_found,my_string