YOU SAID:

$popND =~ /([\d,]+) \(2015 est\)/;

INTO JAPANESE

$ popND =〜/（[\ dを、] ）\（2015 EST \）/。

BACK INTO ENGLISH

$ popND = ~ / ([/ d, a]) / (2015 EST /) /.

INTO JAPANESE

$ popND = ~/([/d])/(米国東部標準時刻 2015年/)/。

BACK INTO ENGLISH

$ popND = ~ / ([/ d]) / (United States eastern standard time / 2015) /.

INTO JAPANESE

$ popND = ~/([/d])/(アメリカ合衆国東部標準時/2015)/。

BACK INTO ENGLISH

$ popND = ~ / ([/ d]) / (United States eastern standard time / 2015) /.