CODEWITHSUNDEEP
regexswift
eharo2
eharo2

Reputation: 2642

matchesInString function returning an empty Array in Swift

I have this code working in Objective-C

NSRegularExpression* regex = [[NSRegularExpression alloc] initWithPattern:@"(.*?)(<[^>]+>|\\Z)" options:NSRegularExpressionCaseInsensitive|NSRegularExpressionDotMatchesLineSeparators error:nil];
NSArray* results = [regex matchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, text.length)];

But the Swift version is not working. The matchesInString is returning an empty Array (using the same tagged text in both cases)

let regexOptions = NSRegularExpressionOptions.CaseInsensitive | NSRegularExpressionOptions.DotMatchesLineSeparators
let regex = NSRegularExpression.regularExpressionWithPattern("(.*?)(<[^>]+>|\\Z)", options: regexOptions, error: nil)
var results = regex.matchesInString(markupText, options: nil, range: NSMakeRange(0, countElements(markupText))) as Array<NSTextCheckingResult>

Even though the documentation states that the matchesInString returns an Array of NSTextCheckingResult, I noted that in the Objective-C code (that works) the Array contains NSSimpleRegularExpressionCheckingResult objects and not NSTextCheckingResult objects. The empty Array reported in the Swift version reports zero NSTextCheckingResult objects though

Any idea of what is missing here?

Upvotes: 0

Views: 1407

Answers (1)

Stefan Arentz
Stefan Arentz

Reputation: 34935

Update, this works for me:

let regexOptions:NSRegularExpressionOptions?
    = NSRegularExpressionOptions.CaseInsensitive

var matchingError : NSError?
let regex = NSRegularExpression(pattern: "(.*?)(<[^>]+>|\\Z)",
    options: regexOptions!, error: &matchingError)

let markupText = "<html></html>"

let results = regex.matchesInString(markupText, options: nil,
    range: NSMakeRange(0, countElements(markupText))) as Array<NSTextCheckingResult>

I am not sure why regexOptions has to be an optional. May be a bug in the compiler.

Older thoughts

This may be a bug in Xcode6b2. I simplified your example to just one line:

let regexOptions = NSRegularExpressionOptions.CaseInsensitive

And I get this error:

fatal error: Can't unwrap Optional.None

I would file a bug for this.

Upvotes: 4

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