Swift Get substring after last occurrence of character in string

You can use BidirectionalCollection method lastIndex(of: Element) and get the substring from there and drop the first character:

let text = "Hello, playground! Hello World!!!" if let index = text.lastIndex(of: " ") { let afterEqualsTo = String(text.suffix(from: index).dropFirst()) print(afterEqualsTo) } 

Another option is to use options backwards when using range of string as you tried above:

let text = "Hello, playground! Hello World!!!" if let index = text.range(of: " ", options: .backwards)?.upperBound { let afterEqualsTo = String(text.suffix(from: index)) print(afterEqualsTo) // "World!!!\n" } 

If you would like to get all users in your string you should use a regex like "@\w+\b" and iterate over your whole string. if you want to exclude the character @ from your results you can use a positive lookbehind pattern like "(?<=@)\w+\b"

let text = "Hey @John did you talk to @Jim today?" var ranges: [Range<String.Index>] = [] var start = text.startIndex let pattern = #"@\w+\b"# while start < text.endIndex, let range = text[start...].range(of: pattern, options: .regularExpression) { ranges.append(range) start = text.index(range.upperBound, offsetBy: 1, limitedBy: text.endIndex) ?? text.endIndex } let users = ranges.map { text[$0] } users // ["@John", "@Jim"] 

or using the positive lookbehind pattern "(?<=@)\w+\b"

users // ["John", "Jim"]