Как найти определенный символ в string в swift?

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let text = "Hello, world!"
if text.contains("o") {
    print("Found 'o' in text")
}

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let text = "Hello, world!"
if text.contains(where: { $0 == "o" }) {
    print("Found 'o' in text")
}

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let text = "Hello, world!"
if let index = text.firstIndex(of: "o") {
    print("Found 'o' at index (index)")
}

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let text = "Hello, world!"
if text.characters.contains("o") {
    print("Found 'o' in text")
}

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import Foundation

let text = "Hello, world!"
let regex = try! NSRegularExpression(pattern: "o", options: [])
let range = NSRange(location: 0, length: text.utf16.count)
if let _ = regex.firstMatch(in: text, options: [], range: range) {
    print("Found 'o' in text")
}