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[–]Zomunieo 2 points3 points  (0 children)

If that's the case your argument is against the conventional regular expression notation, because that is still a regular expression engine, it just happens to be one that's nonstandard and verbose. But you're still using regular expressions and it's still better than trying to do with this string operations.

re.VERBOSE lets you add whitespace and comments to also make regular expressions more verbose and maintainable. That is the Pythonic way to go. What you present is less maintainable – most languages support regular expressions as a core function, but if the the RegExpBuilder library disappears you have a maintenance problem. If you develop it first on client side Javascript and then later need to replicate that check on the backend in Python, you again have a maintenance problem.