I’d like your help in defining what kind of strings can be expected in Bulgarian house numbers, see here Enable discarding "are you sure?" popups for ever for advanced users · Issue #5683 · streetcomplete/StreetComplete · GitHub The one I think is most important is the occurence of “бл.” in them (addr:housenumber=бл. 21 for instance), but are there others? Are there strings that should be excluded (such as “вх.”: the entrance letter should go into ref=* on the entrance=staircase node)?
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Could anyone make some photos how building addresses looks “on the ground” (= on buildings 
) in Bulgaria?
Looking at addr:housenumber | Keys | OpenStreetMap Taginfo Bulgaria, some addresses have letters (А-Я) and they should be in Cyrillic (not in Latin). Other than that, I don’t see anything else.
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That’s a nice subject for a photo safari!
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Thanks! It looks like apart from straight numbers, the most common additional characters/strings are numbers followed directly by a Cyrillic letter (А, Б, а are the most common), бл. /бл. (without space is more common), and hyphenated numbers such as 2-4. Sometimes there’s a space or hyphen between a number and the following Cyrillic letter. Anything else has less than 5 occurrences. The first one in the list that I think should be regarded as wrong is “вх.1” (4 times)
A regex was developed, see here Please test! It makes the distinction between Cyrillic and Latin script (бл.107-А is accepted, бл.107-A not because the first A was entered using Bulgarian keyboard and the second using Latin keyboard). It also accepts strings like 2-4 and 2-4-6 but not 2-4-6-8
Credits @Matija_Nalis
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