import Foundation
let pattern = ##"""
<\? # opening tag
[^?\/]* # all that is not a ? or a /
(?:
\/ # a slash:
(?:
(?![\/*]) [^?\/]* # - not followed by a slash or a *
|
\/.*(?:\n[^?\/]*)? # - that starts a single line comment
|
\* # - that starts a multiline comment
[^*]* (?:\*+(?!\/)[^*]*)* # (comment content)
(?:\*\/ [^?\/]* | $) # */ is optional
)
|
\?(?!>) [^?\/]* # a ? not followed by a >
)*
(?:\?>|$) # optional closing tag ?>
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = #"""
<? /* hello */ ?>
html
<? /* world*/ ?>
<? /// ?>
dfgdfgdfg?>
<? /* ?> */ ?>
<? /* unclosed
multiline
comment
works until the end of the string
"""#
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