import Foundation
let pattern = ##"""
@font-face\s* # Match @font-face and some spaces
( # Start group 1
\{ # Match {
(?: # A non-capturing group
[^{}]+ # Match anything except {} one or more times
| # Or
(?1) # Recurse/rerun the expression of group 1
)* # Repeat 0 or more times
\} # Match }
) # End group 1
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = ##"""
.someclass0 {
background: url('http://images/someimage.png') no-repeat;
}
@font-face {
font-family: 'FontAwesome';
src: url("fonts/fontawesome-webfont.eot?v=4.0.3");
src: url("fonts/fontawesome-webfont.eot?#iefix&v=4.0.3") format("embedded-opentype"), url("fonts/fontawesome-webfont.woff?v=4.0.3") format("woff"), url("fonts/fontawesome-webfont.ttf?v=4.0.3") format("truetype"), url("fonts/fontawesome-webfont.svg?v=4.0.3#fontawesomeregular") format("svg");
font-weight: normal;
font-style: normal;
}
.someclass1 {
background: url('images/someimage.png') no-repeat;
}
.someclass2 {
background: url("images/someimage.png") no-repeat;
}
.someclass3 {
background: url(images/someimage.png) no-repeat;
}
"""##
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