Parser does not fail for some invalid expressions

[oli-ver]

Currently the parser accepts the following datemath expressions (and just returns "now" in UTC):

+1ö
+1ä
+1ü
+1ß
+1,
+1.

Expected behavior: Error message "Not a valid timeunit: "

I debugged the code to check why this is happening. It seems you are using the regular expression [a-zA-Z] to validate the character before beginning to calculate the date. Unfortunatley this leads to just leaving the while loop in helper.py without any further processing (or error handling):

Kind regards

Oliver

[nickmaccarthy]

Thanks for finding this @oli-ver , this is something I have wanted to circle back on for a while, but never found the time. I created PR https://github.com/nickmaccarthy/python-datemath/pull/17/files . If you get a chance, can you test that branch and let me know if you find any issues?

[oli-ver]

I tested it again. the validation works as expected now.
Thanks for fixing this so fast @nickmaccarthy.