import Foundation
let pattern = ##"^#([A-F0-9]{3}){1,2}$"##
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .caseInsensitive])
let testString = ##"""
Only matches when there are 3 & 6 digits
#
#1
#12
#123
#1234
#12345
#123456
#1234567
Only matches if the letters used are: A, B, C, D, E & F
#ABCDEF
#BCDEFG
#0A1B2C
#0E1F2Z
Must use the 'i' flag to match lower & upper case.
#AaBbCc
Arbitrary examples
#15F
#C88
#9264FA
#fF0eE1
#FFFXFF
#FFFYFF
#ABCDEF
#ABC*EF
#778657
#E9B3C4
"""##
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