Our profanity filter thought Pospíchalova was a swear word.

Every text people add to the map goes through a profanity check. Over the weekend I ran it across the whole catalogue for the first time. 8 blocks, and 0 of those texts were profane. Picassova, Negrelliho, and for instance “retardér u vjezdu na hřiště” (a speed bump at the entrance to a court).

The filter looked for short terms anywhere inside a word, and Czech street names contain them surprisingly often. The fix was small, and the new filter reports zero false alarms.

Only then did it hit me that in all that time nobody had complained. A person whose own street name gets rejected by a form usually doesn’t write to support. They just close it.

Do you block hard right in the form, or do you prefer to validate later, in post-moderation?