re.sub 方法不适用于“$”模式

Question

Am trying to replace 'and' at the end of the string with re.sub method. But either all the 'and' are getting changed or nothing is getting changed. I need to replace and only at the end.

fvalue = "$filter = Name eq 'abc' and Address eq 'xyz' and "
regex = r'(and\$)'
f_value = re.sub(regex,'',fvalue)
print(fvalue)

Output

$filter = Name eq 'abc' and Address eq 'xyz' and

Answer 1

You have a couple of problems with your code. First, you're printing the input, not the output. But also, you're escaping the $ as pointed out in the comments, and you have whitespace after the "and" in the input but before the end of the string, so (and$) will not match either.

Try something like this:

fvalue = "$filter = Name eq 'abc' and Address eq 'xyz' and "
regex = r'and\s*$'
f_value = re.sub(regex,'',fvalue)
print(f_value)

I removed the capture group, since you're not using it, unescaped the $ anchor, and inserted possible whitespace ( \\s* ).

And finally, print the result f_value instead of the input fvalue .