import Foundation
let pattern = #"\{\\rtf1\\ansi\\ansicpg1252(?:.|[\r\n]+)*\{\\\*\\listtable"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
{\rtf1\ansi\ansicpg1252
\deff0{\fonttbl{\f0\froman\fcharset0 Times New Roman;}{\f1\froman\fcharset0 HELVETICA;}{\f2\froman\fcharset0 Arial;}{\f3\froman\fcharset0 unknown;}{\f4\froman\fcharset0 HELVETICA-BOLD;}{\f5\froman\fcharset0 Helvetica;}}
{\colortbl\red0\green0\blue0;\red255\green255\blue255;\red244\green245\blue255;\red254\green182\blue230;\red0\green0\blue255;}
{\stylesheet
{\style\s0 \ql\fi0\li0\ri0\f2\fs24\cf0 Normal;}
{\style\s3 \ql\fi0\li0\ri0\f2\fs26\b\cf0 heading 3;}
{\style\s2 \ql\fi0\li0\ri0\f2\fs28\b\i\cf0 heading 2;}
{\style\s1 \ql\fi0\li0\ri0\f2\fs32\b\cf0 heading 1;}
}
{\*\listtable
{\style\s0 \ql\fi0\li0\ri0\f2\fs24\cf0 Normal;}
{\style\s3 \ql\fi0\li0\ri0\f2\fs26\b\cf0 heading 3;}
{\style\s2 \ql\fi0\li0\ri0\f2\fs28\b\i\cf0 heading 2;}
{\style\s1 \ql\fi0\li0\ri0\f2\fs32\b\cf0 heading 1;}
}
{\*\listtable
}
{\*\listoverridetable
}
{\*\generator iText 2.1.2 (by lowagie.com)}
{\info}
"""#
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