import Foundation
let pattern = ##"""
(?:
" \s*
(?=
(?: SELECT | FROM )
)
|
(?<! ^ )
\G
)
[^"]*?
\K
( SELECT | FROM ) # (1)
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = #"""
SELECT * FROM main -- will not match (not in a string)
"SELECT name FROM main" -- will match
"
SELECT name FROM main" -- will match
"""Here is a SQL statement:
SELECT * FROM main""" -- no, string does not start with a keyword (SELECT...).
"SELECT * FROM table"
"
SELECT * FROM table"
"""#
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