Swift Regex Matching

Question

The pattern is not the issue

I have a regex string

var elementRegex = \"([A-Z][a-z]?)(\\\\d*)?\"

I want to match t

Answer 1

This is not a Swift specific question but more a Cocoa question. You don't specify wether you are developing for OS X or iOS but both have excellent regular expression support via NSRegularExpression and NSString.

Here is and example of their usage in Swift:

let s: NSString = "Al3Br3"
if let r = NSRegularExpression(pattern: "([A-Z][a-z]?)(\\d*)?", options: NSRegularExpressionOptions.allZeros, error: nil) {
    for match in r.matchesInString(s, options: NSMatchingOptions.allZeros, range: NSMakeRange(0, s.length)) as [NSTextCheckingResult] {
        println("Match:")
        for i in 0..<match.numberOfRanges {
            println("\(i): \(s.substringWithRange(match.rangeAtIndex(i)))")
        }
    }
}

This results in:

Match:
0: Al3
1: Al
2: 3
Match:
0: Br3
1: Br
2: 3