Deco Deco - 6 months ago 12
Swift Question

Can I stop my capture group from being overwritten?

I'm trying to capture the first delimiter used within a phone number in order to identify what's used as a numbers internal delimiter and what's used to separate two numbers.

Right now I can identify the last delimiter. It appears the capture group is overwritten each time a new value is picked up. Is there anyway of retaining what is first captured using a flag or a specific swift method?

Regex

(?:\\d([\\-\\. ])?){7,15}


Swift Method

func regexParse(pattern:String, captureGroup:Int, caseSensitive:Bool) ->[String]
{
do
{
//Creates empty results array.
var resultsArray = [String]()

//Sets Case sensitivity
var caseSensitivity = NSRegularExpressionOptions.CaseInsensitive
if(caseSensitive)
{
caseSensitivity = NSRegularExpressionOptions.init(rawValue: 0)
}

//Sets regex to correct pattern
let regex = try NSRegularExpression(pattern: pattern, options: caseSensitivity)
//Converts string to NSString as swift doesn't support regex
let nsString = self as NSString

//Sets parsing range to the entire string
let all = NSMakeRange(0, nsString.length)

//Enumerates through all matches and extracts the 1st capture bracket for each match and adds it to the resultsArray.

regex.enumerateMatchesInString(self, options: NSMatchingOptions(rawValue: 0), range: all) { (result: NSTextCheckingResult?, _, _) in
let capturedRange = result!.rangeAtIndex(captureGroup)
if !NSEqualRanges(capturedRange, NSMakeRange(NSNotFound, 0))
{
let theResult = nsString.substringWithRange(capturedRange)
resultsArray.append(theResult)
}
}
return resultsArray

}
catch
{
print("Invalid regex")
return(["Error"]) //Maybe refactor this for something that's impossible to be a valid result
}
}

Answer

You need to use this regex:

\d+([-. ])[-.\d]*

To get the delimiter, which will be in the capturing group

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