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#python の findall で #正規表現 マッチをおこなうと、戻り値には割と癖があるので注意

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Last updated at Posted at 2019-05-06

グルーピングなしの場合

マッチした全体が配列で返ってくる

>>> re.findall(r'lic', 'AliceAliceAlice')
['lic', 'lic', 'lic']

カッコでグルーピングした場合

グルーピングした部分のマッチ結果が配列が返ってくる

>>> re.findall(r'l(i)c', 'AliceAliceAlice',)
['i', 'i', 'i']

カッコで複数グルーピングした場合

tuple の配列が返ってくる

>>> re.findall(r'A(li)(ce)', 'AliceAliceAlice')
[('li', 'ce'), ('li', 'ce'), ('li', 'ce')]

グルーピングしつつキャプチャしない書き方

>>> re.findall(r'l(?:i)c', 'AliceAliceAlice')
['lic', 'lic', 'lic']

Original by Github issue

チャットメンバー募集

何か質問、悩み事、相談などあればLINEオープンチャットもご利用ください。

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