let text = "it is need #match my both #hashtag!"
// create an object to store the ranges found
var ranges: [Range<String.Index>] = []
// create an object to store your search position
var start = text.startIndex
// create a while loop to find your regex ranges
while let range = text.range(of: "(?:^#|\\s#)[\\p{L}0-9_]*", options: .regularExpression, range: start..<text.endIndex) {
// append your range found
ranges.append(range)
// and change the startIndex of your string search
start = range.lowerBound < range.upperBound ? range.upperBound : text.index(range.lowerBound, offsetBy: 1, limitedBy: text.endIndex) ?? text.endIndex
}
ranges.forEach({print(text[$0])})
这将打印
#match
#hashtag
如果你需要使用它不止在你的代码,一旦你要这个扩展添加到您的项目:
extension String {
func ranges(of string: String, options: CompareOptions = .literal) -> [Range<Index>] {
var result: [Range<Index>] = []
var start = startIndex
while let range = range(of: string, options: options, range: start..<endIndex) {
result.append(range)
start = range.lowerBound < range.upperBound ? range.upperBound : index(range.lowerBound, offsetBy: 1, limitedBy: endIndex) ?? endIndex
}
return result
}
}
用法:
let text = "it is need #match my both #hashtag!"
let pattern = "(?:^#|\\s#)[\\p{L}0-9_]*"
let ranges = text.ranges(of: pattern, options: .regularExpression)
let matches = ranges.map{text[$0]}
print(matches) // [" #match", " #hashtag"]
https://stackoverflow.com/questions/32305891/index-of-a-substring-in-a-string-with-swift/32306142#32306142你需要实现它自己。检查方法范围(的:)我如何完成这个 –
@LeoDabus我正在寻找一个香草解决方案,没有扩展或过度工程。我的情况很简单,我会在一种情况下使用它。但是,谢谢。 – Macabeus
如果您想使用该方法,除了自己实现它之外,您没有其他选择 –