python string replace does not work

title: understanding python string replace: common pitfalls and solutions
introduction:
one crucial aspect to understand is that strings in python are immutable. this means that any operation that appears to modify a string actually creates a new string. the replace() method follows this principle.
output:
in this example, the replace() method does not modify the original string but instead returns a new string with the specified replacement.
by default, the replace() method is case-sensitive. if you want to perform a case-insensitive replacement, you can use other methods, such as regular expressions.
output:
in this case, the replace() method does not find a match due to case sensitivity.
solution: use a case-insensitive approach with regular expressions or convert the strings to lowercase before applying the replace() method.
if you intend to modify the original string in-place, you should assign the result back to the variable.

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