import Foundation
let pattern = ##"""
<\s*meta\s
# using lookahead to capture type to $1
(?=[^>]*?
\b(?:name|property|http-equiv)\s*=\s*
(?|"\s*([^"]*?)\s*"|'\s*([^']*?)\s*'|
([^"'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
)
# capture the content to $2
[^>]*?\bcontent\s*=\s*
(?|"\s*([^"]*?)\s*"|'\s*([^']*?)\s*'|
([^"'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
[^>]*>
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: [.caseInsensitive, .allowCommentsAndWhitespace])
let testString = #"""
<meta content = foo name = bar />
<meta name= bar sdf content= foo >
<meta content="name" name="author">
<meta name ="keywords" content = " php documentation ">
<meta name= "DESCRIPTION" content=" a php manual ">
<meta name="geo.position" content="49.33;-86.59 ">
<meta content=' 49.33;-86.59' name = geo.position >
"""#
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