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文字列から指定の文字以降を削除する

Posted at
str = "A30-60_10000"

後ろを消す

str.sub(/_.*/, "")

結果↓

=> "A30-60"

前を消す

str.sub(/.*_/, "")

結果↓

"10000"

参考
https://qiita.com/flmil/items/8cbfbf49844ddef79000

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