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10.4 Éôʬʸ»úÎó¤òÃê½Ð¤¹¤ë

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substr(string, from, opt length)

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substr(`gnus, gnats, and armadillos', 6)
⇒gnats, and armadillos
substr(`gnus, gnats, and armadillos', 6, 5)
⇒gnats

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