12 Apr
2006
12 Apr
'06
7:38 p.m.
repeat<1,3>(_d) will match one digit, or two digits, or three digits. So, yes, it will match days (which are one or two digits) or months (which are one or two digits). However, it is overly permissive, because it will also match three digits, which is not a valid day or month.
Sorry ... VERY red-face on this regex newbie. You are very gracious.