replacingOccurrencesを使用する。
ofに置換前、withに置換後の文字列を設定する。
import Foundation
// 置換前の文字列
var str: String = "ABC"
// 置換を行う
var newStr = str.replacingOccurrences(of: "A", with: "4")
// "4BC"と出力される。
print(newStr)
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