import Foundation
let pattern = #"(\\usepackage{(?:tikz|pgfplots)}|\\(?:tikzset|pgfplotsset){(?:[^{}]+|{(?:[^{}]+|{(?:[^{}]+|{[^{}]+})+})+})+}|\\(?:usetikzlibrary|usepgfplotslibrary){[\w\.,]+}|\\definecolor{\w+}{\w+}{[^}]+}|\\colorlet{\w+}{{[^}]+}})"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = ##"""
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\tikzset{
->-/.style={
postaction=decorate,
decoration={markings,mark=at position #1 with \arrow{>}}
}
}
\begin{document}
\begin{center}
\begin{tikzpicture}
\draw[->-=0.5] (0,0) -- (3,-2);
\end{tikzpicture}
\end{center}
\end{document}
"""##
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