import Foundation
let pattern = ##"^#+(.+)\n*((?:\n(?:^[^\n#].{0,2}$|^[^\n#].{3}(?<!<!--).*))+)"##
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = ###"""
# Style
This style is suitable for having the header as the front, and the answer as the back
1 newline
<!--ID: 1717098832201-->
# Style
This style is suitable for having the header as the front, and the answer as the back
1 newline
1 newline with blanks
2 newlines
2 newlines with blanks
2 newlines mixed blanks
<!--ID: 1717098832201-->
# Overall heading
## Subheading 1
You're allowed to nest headers within each other
1 newline
1 newline with blanks
2 newlines
2 newlines with blanks
2 newlines mixed blanks
## Subheading 2
It'll take the deepest level for the question
1 newline
1 newline with blanks
2 newlines
2 newlines with blanks
2 newlines mixed blanks
## Subheading 3
It'll even
Span over
Multiple lines, and ignore preceding whitespace
1 newline
1 newline with blanks
2 newlines
2 newlines with blanks
2 newlines mixed blanks
"""###
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