import Foundation
let pattern = ##"""
^(\+?((\.\d+([eE]-\d+)?)|((0+(\.0*)?|\.0+)([eE]\+?\d+)?)|(0+\.\d*([eE]-\d+)?)|((1|1\.0*)([eE]-\d+)?)|(\d(\.\d*)?([eE]-[1-9]\d*)))\s+){3}(\+?((\.\d+([eE]-\d+)?)|((0+(\.0*)?|\.0+)([eE]\+?\d+)?)|(0+\.\d*([eE]-\d+)?)|((1|1\.0*)([eE]-\d+)?)|(\d(\.\d*)?([eE]-[1-9]\d*))))$(
# just a way to comment
# The ^$ anchors are there because xml always assumes them.
# They are required here for proper testing.
)*
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"0.0e10 .0e+10 .0 0e-10"#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
if let firstMatch = regex.firstMatch(in: testString, range: stringRange) {
let result: [String] = (1 ..< firstMatch.numberOfRanges).map { (testString as NSString).substring(with: firstMatch.range(at: $0)) }
print(result)
} else {
print("No matches were found.")
}
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