import Foundation
let pattern = #"(?:\$\w+(?:\((?<arg>(?R)|(?:\"[^\"]*\")|(?:[^\$\"\&\s\(\)][^\s\(\)]*))(?:(?:\+| )(?&arg))*\))?)|(?<var>\&\w+)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = ##"""
$test($test(test &var1 $var2) $test(jean) jean) # should full-match
$test($test(test $var1 $var2) $test(foo) bar) # should not full-match
$test("&test") # should not full-match
$test("foo&test") # should not full-match
$test("&test" &test) # should full-match
&test # should full-match
$test(" &test") # should not full-match
$test # should not full-match
&test(foo) # should not full-match
&test(&foo $bar()) # should not full-match
$test((&test)) # should not full-match
$foo(bar(&baz)) # should not full match
$test(&test &test) # should not full match
$test( &test) # should not full match
$test(&test ) # should not full match
"""##
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