Deletes after the specified character from the character string

str = "A30-60_10000"

Erase the back

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

Result ↓

=> "A30-60"

Erase the front

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

Result ↓

"10000"

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

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