The regex [,-.]

I stumbled on this regex recently: \d{2}[,-.]\d{2}. The intention is clear enough: match two sets of two digits separated by a comma, a dash, or a period. Of course, it shouldn’t work. Dashes in character classes are special because they’re used for ranges (like [a-z] to match lower-case ASCII letters). If you want - in a character class you put it at the beginning, or the end, never the middle. S

[rh-kimata]

区切り子の増減があったときにバグりそうなのでちゃんとエスケープしたい

[kaputte]

こんなんやるべきじゃない

[ABA]

-がASCIIコードで,と.の間の文字のため、正規表現で特殊な文字であるにも関わらずたまたま意図通りの動作をする例

[AKIMOTO]

偶然か達人か