import Foundation
let pattern = #"(?:SELECT\s+|,\s*)[\s\S]*?\s?([^,]+?)\s+AS\s+Error.*"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
SELECT t1.dummy1, t1.dummy2 AS Error, t1.dummy3 INTO testResult
FROM (test1 t1 INNER JOIN test2 t2 ON t1.dummy4 = t2.dummy4) INNER JOIN test3 t3 ON t2.dummy9 = t3.dummy9
WHERE t2.dummy6 = 'abc' AND t3.dummy10 <> 'def' AND t1.dummy11 = 'ghi' AND t2.dummy12 IS NULL
GROUP BY t1.dummy1
HAVING 1=1
ORDER BY 1;
"""#
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