import Foundation
let pattern = #"(?m)^(?: +|\t+)\+ *(?:VAR|CONST) *\w+ *=.*(?:\R^(?> +|\t+)[^+\s].*)*"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
+ VAR name1 = var indented by two spaces and the first nonspace character is '+'
+ VAR name2 = var indented by 2x2 spaces
+ VAR name3 = var indented by one \t
+ VAR name4 = the next line with "name5" is not valid. missing the = character, should not be matched
+ VAR name5
+ CONST name6 = the type could be VAR or CONST
+ VAR multi1 = multiline value where the continuation lines
are indented (starts with two spaces or one tab) and NOT followed by the '+'
+ VAR multi1 = multiline value
indented
+ VAR multi1 = multiline value
indented ok too
+ VAR single = this is single line
+ because this line even if it is indented, the first nonspace character is '+'
+ VAR multi2 = multiline
could be
indented
any way
and any number of times
until the first non-indented line
the following should NOT match
+ VAR some = sould not be matched, because the line isn't indented
+ VAR some = sould not be matched, because the line isn't indented at least with TWO spaces or one tab
+ SOME name = value not matched because the SOME isn't VAR or CONST
"""#
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