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regexswift
Ezekiel
Ezekiel

Reputation: 2514

Swift Regex Matching

The pattern is not the issue

I have a regex string

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

I want to match that to text. Example would be matching it to Al3Br3, where I would expect the result to be

Al,3 and Br,3

How can I do this?

Upvotes: 0

Views: 1383

Answers (1)

Stefan Arentz
Stefan Arentz

Reputation: 34945

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

Upvotes: 2

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