import Foundation
let pattern = ##"""
(['"`]) # capture this quote character
(?:\\.|(?!\1).)* # any escaped character, or
# any character that isn't the captured one
\1 # the captured quote again
(*SKIP)(*FAIL) # ignore this
|
\?\?? # one or two question marks
|
::?\w+ # word characters marked with one or two colons
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = #"""
INSERT INTO xyz WHERE
a=?
and b="what?"
and ??="cheese"
and `col?`='OK'
and ::col='another'
and last!=:least
and b="wha\"t?"
"""#
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