按大写单词/字符和数字拆分字符串 [英] Split string by uppercase words/chars and numerics

问题描述

我有这样的字符串- H2SO4liH2，我需要用大写字母和数字分割此字符串。在外面我需要得到像这样的数组
H2， S， O4， Li， H2或
H， 2， S， O， 4， Li， H， 2

I have the string like this - "H2SO4liH2", i need to split this string by uppercase elements and numerics. At the out i need to get array like this "H2", "S", "O4", "Li", "H2" or "H", "2", "S", "O", "4", "Li", "H", "2"

推荐答案

这使用了toheedNiaz的答案，但是在Swift上下文中：

This uses the pattern provided in toheedNiaz's answer but in a Swift context:

let string = "H2SO4LiH2"

let pattern = "[A-Z][^A-Z]*"
do {
    let regex = try NSRegularExpression(pattern: pattern)
    let matches = regex.matches(in: string, range: NSRange(string.startIndex..., in: string))
    for match in matches {
        let range = Range(match.range, in: string)!
        print(string[range])
    }
} catch {
    print("Regex Error:", error)
}

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