Swift 3 – How do I extract captured groups in regular expressions?

by

Swift 4, Swift 5

extension String {
    func groups(for regexPattern: String) -> [[String]] {
    do {
        let text = self
        let regex = try NSRegularExpression(pattern: regexPattern)
        let matches = regex.matches(in: text,
                                    range: NSRange(text.startIndex..., in: text))
        return matches.map { match in
            return (0..<match.numberOfRanges).map {
                let rangeBounds = match.range(at: $0)
                guard let range = Range(rangeBounds, in: text) else {
                    return ""
                }
                return String(text[range])
            }
        }
    } catch let error {
        print("invalid regex: \(error.localizedDescription)")
        return []
    }
}
}

example:

let res = "1my 2own 3string".groups(for:"(([0-9]+)[a-z]+) ")

(lldb) po res ▿ 2 elements
▿ 0 : 3 elements

- 0 : "1my "

- 1 : "1my"

- 2 : "1"

▿ 1 : 3 elements

- 0 : "2own "

- 1 : "2own"

- 2 : "2"

More Related Contents:

  1. Awk – replace coumn 2 in table 1 from coumn 2 in table 2 based on matching data in column 1 (common between tables)
  2. How do you match only valid roman numerals with a regular expression?
  3. Regex to match string containing two names in any order
  4. Validating IPv4 addresses with regexp
  5. Find CRLF in Notepad++
  6. What flavor of Regex does Visual Studio Code use?
  7. Jmeter extracting fields/parsing JSON response
  8. How to back reference “inner” selections ( () ) in a regular expression?
  9. Regular expression – PCRE does not support \L, \l, \N, \P,
  10. Extract RGB Values From UIColor
  11. What is the ‘open’ keyword in Swift?
  12. mod_rewrite: replace underscores with dashes
  13. Multiline regex to match config block
  14. Remove ‘index.php’ from URL with .htaccess
  15. Negative look-ahead in Go regular expressions
  16. R – gsub replacing backslashes
  17. Regular expression to count number of commas in a string
  18. Xcode 9 Swift Language Version (SWIFT_VERSION)
  19. How to validate a user name with regex?
  20. Match at every second occurrence
  21. What does ‘\K’ mean in this regex?
  22. custom interactive transition animation
  23. How to use awk variables in regular expressions?
  24. How to post nested json by SwiftyJson and Alamofire?
  25. Nginx location “not equal to” regex
  26. How to escape dollar sign ($) in a string using perl regex
  27. Regex for field that allows numbers and spaces
  28. Remove all characters before a period in a string
  29. powershell extract text between two strings
  30. Get Twitter @Username with Regex in R

Leave a Comment