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正則表現 括弧でグループ

Last updated at Posted at 2018-02-26

置換前
abc12fa
abc23fb
abc45fc
abc67fd
abc78fe
abc32ff

以下に変更したい(fの前gを追加したい)
abc12gfa
abc23gfb
abc45gfc
abc67gfd
abc78gfe
abc32gff

括弧でグループして、置換後は

$1→一番目の括弧

$2→二番目の括弧

$3→三番目の括弧(置換後に$3がなければ、置換対象、下図ようにgfに置換)

$4→四番目の括弧

image

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