import Foundation
let pattern = #"(?<!foo.{0,1000})bar(?!.*foo)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
bar //true
,bar, //true
,,bar,, //true
barbar //true
,bar,bar, //true
,,bar,,bar,, //true
barbarbar //true
,bar,bar,bar, //true
,,bar,,bar,,bar,, //true
foo //false
,foo, //false
,,foo,, //false
foobar //false
,foo,bar, //false
,,foo,,bar,, //false
barfoo //false
,bar,foo, //false
,,bar,,foo,, //false
foofoo //false
,foo,foo, //false
,,foo,,foo,, //false
foobarbar //false
,foo,bar,bar, //false
,,foo,,bar,,bar,, //false
barfoobar //false
,bar,foo,bar, //false
,,bar,,foo,,bar,, //false
barbarfoo //false
,bar,bar,foo, //false
,,bar,,bar,,foo,, //false
barfoofoo //false
,bar,foo,foo, //false
,,bar,,foo,,foo,, //false
foobarfoo //false
,foo,bar,foo, //false
,,foo,,bar,,foo,, //false
foofoobar //false
,foo,foo,bar, //false
,,foo,,foo,,bar,, //false
foofoofoo //false
,foo,foo,foo, //false
,,foo,,foo,,foo,, //false
"""#
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