import Foundation
let pattern = #"(\b\w.{3,49})\1{4}"#
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .dotMatchesLineSeparators])
let testString = #"""
I like fish very much I like fish very much I like fish very much
Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy.
But this would not be:
I like fish very much I like fish very much I like fish very much I like fish very much I like fish very much I like fish very much I like fish very much I like fish very much
nor this:
Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy. Marshmallows are yummy.
Ideally, it would also catch it even if it was entered like this:
I like fish very much
I like fish very much
I like fish very much
I like fish very much
I like fish very much
I like fish very much
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let matches = regex.matches(in: testString, range: stringRange)
var result: [[String]] = []
for match in matches {
var groups: [String] = []
for rangeIndex in 1 ..< match.numberOfRanges {
let nsRange = match.range(at: rangeIndex)
guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue }
let string = (testString as NSString).substring(with: nsRange)
groups.append(string)
}
if !groups.isEmpty {
result.append(groups)
}
}
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression