名前付きキャプチャの正規表現のエラーを修正したい
解決したいこと
下記、正規表現をRubyに移植したい。
( from python 3.7 to ruby 2.7 )
# Adapted from http://stackoverflow.com/questions/2764269/parsing-an-xsduration-datatype-into-a-python-datetime-timedelta-object
_duration_parser = re.compile(
(r'(?P<sign>-?)P(?:(?P<years>\d+\.?\d*)Y)?(?:(?P<months>\d+\.?\d*)M)?(?:(?P<days>\d+\.?\d*)D)?(?:T(?:(?P<hours>\d+\.?\d*)H)?(?:(?P<minutes>\d+\.?\d*)M)?(?:(?P<seconds>\d+\.?\d*)S)?)?'))
発生している問題・エラー
@_duration_parser = Regexp.compile('(?P<sign>-?)P(?:(?P<years>\d+\.?\d*)Y)?(?:(?P<months>\d+\.?\d*)M)?(?:(?P<days>\d+\.?\d*)D)?(?:T(?:(?P<hours>\d+\.?\d*)H)?(?:(?P<minutes>\d+\.?\d*)M)?(?:(?P<seconds>\d+\.?\d*)S)?)?')
Uncaught exception: undefined group option: /(?P<sign>-?)P(?:(?P<years>\d+\.?\d*)Y)?(?:(?P<months>\d+\.?\d*)M)?(?:(?P<days>\d+\.?\d*)D)?(?:T(?:(?P<hours>\d+\.?\d*)H)?(?:(?P<minutes>\d+\.?\d*)M)?(?:(?P<seconds>\d+\.?\d*)S)?)?/
自分で試したこと
PやYやTといった文字を外すとエラーは消えますが、Match groupとしては間違っているように思われます。
Error: Line 1: expected "?"
(?P<sign>-?)P(?:(?P<years>\d+\.?\d*)Y)?(?:(?P<months>\d+\.?\d*)M)?(?:(?P<days>\d+\.?\d*)D)?(?:T(?:(?P<hours>\d+\.?\d*)H)?(?:(?P<minutes>\d+\.?\d*)M)?(?:(?P<seconds>\d+\.?\d*)S)?)?
^
Error:Unexpected char!
(?P<sign>-?)P(?:(?P<years>\d+\.?\d*)Y)?(?:(?P<months>\d+\.?\d*)M)?(?:(?P<days>\d+\.?\d*)D)?(?:T(?:(?P<hours>\d+\.?\d*)H)?(?:(?P<minutes>\d+\.?\d*)M)?(?:(?P<seconds>\d+\.?\d*)S)?)?
--^
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