I feel you, I nowadays prefer doing the calculations in python and export the results in .csv for the freaks who prefer excel

funnily enough, phone number parsing is one of my previous arch enemies. Having to turn whaterver bullshit user has typed into a phone number probably reduced my life expectancy by several months

This reminds me of my futile attempts of parsing URLs with regex in my teenage years when I was trying to make a guestbook for my website with PHP (the solution is .*\..*)