import Foundation
let pattern = #"^\.0*[1-9]\d*$|^0(\.0*[1-9]\d*)$|^[1-9]\d*?(\.\d+)?$"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
0
-0
0.0
0000
.0
.0000
000.
0.0
0.000000
0000.0
0000.1
========================
.1
.0001
.010
0.0001
0.1111
0.1100
0.1
1.0
101
101.0
101.000
101.0001
101.0001000
1111.00000
1000
========================
0111
010.1
0110
000001
000100
"""#
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