I think they're a valuable as a simple tool e.g. using :s/^#// in vim. However, I try to avoid using them in my code unless they improve readability. Using re.

I think they're a valuable as a simple tool e.g. using :s/^#// in vim. However, I try to avoid using them in my code unless they improve readability. Using re.VERBOSE can help in Python. If you find a regex online, you should definitely reference it in your code, to help provide background understanding, such as validating a UK Post Code.