NSRegularExpression 正则匹配带有表情emoji时候匹配不全的情况

当用NSRegularExpression去正则匹配带有表情emoji的字符串的时候，会出现匹配不全的情况

例：

let string = "😳😳😳😳😳😳 [gggg] [gggg] [gggg] [gggg]"
let pattern = "\\[.*?\\]"
if let regularExpression = try? NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.dotMatchesLineSeparators) {
   var matches = regularExpression.matches(in: text, options: NSRegularExpression.MatchingOptions.withTransparentBounds, range: NSRange(location: 0, length: string.count))
   print(matches)
}

只会打印出

image.png

明显是emoji的锅，只要我们改一下range的length就行

let range = NSRange(location: 0, length: string.utf16.count)

就可以正确打印出：

image.png

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