Hi,
I think this is important enough and useful for we to be in the core standard library
extension String {
func index(of string: String, options: String.CompareOptions = .literal) -> String.Index? {
return range(of: string, options: options)?.lowerBound
}
func indexes(of string: String, options: String.CompareOptions = .literal) -> [String.Index] {
var result: [String.Index] = []
var start = startIndex
while let range = range(of: string, options: options, range: start..<endIndex) {
result.append(range.lowerBound)
start = range.upperBound
}
return result
}
func ranges(of string: String, options: String.CompareOptions = .literal) -> [Range<String.Index>] {
var result: [Range<String.Index>] = []
var start = startIndex
while let range = range(of: string, options: options, range: start..<endIndex) {
result.append(range)
start = range.upperBound
}
return result
}
}
Source is not mine, I’ve found here: http://stackoverflow.com/a/32306142/4550651
Best and happy 2017
Carlos García