Split a String into an array in Swift?

Update for Swift 5.2 and the simpliest way

let paragraph = "Bob hit a ball, the hit BALL flew far after it was hit. Hello! Hie, How r u?"

let words = paragraph.components(separatedBy: [",", " ", "!",".","?"])

This prints,

> ["Bob", "hit", "a", "ball", "", "the", "hit", "BALL", "flew", "far",
> "after", "it", "was", "hit", "", "Hello", "", "Hie", "", "How", "r",
> "u", ""]

However, if you want to filter out empty string,

let words = paragraph.components(separatedBy: [",", " ", "!",".","?"]).filter({!$0.isEmpty})

Output,

> ["Bob", "hit", "a", "ball", "the", "hit", "BALL", "flew", "far",
> "after", "it", "was", "hit", "Hello", "Hie", "How", "r", "u"]


But make sure, **Foundation** is imported.

Do not use whitespace to separate words. It will not work well for English. And it will not work at all for languages like Japanese or Chinese.

Here is a sample for tokenizing names from a given string:

import NaturalLanguage

actor Tokenizer {
private let tagger = NLTagger(tagSchemes: [.nameType])

func tokens(for text: String) async -> [String] {
tagger.string = text

let tags = tagger.tags(
in: text.startIndex ..< text.endIndex,
unit: .word,
scheme: .nameType,
options: [
.omitPunctuation,
.omitWhitespace,
.joinNames,
]
)

return tags.map { String(text[$1]) }
}
}