NSString replace repeated newlines with single newline

Question

I have an NSString which can have multiple \\n in between the string. I need to replace the multiple occurrence of \\n\'s with a single \\n.

I tried this co

Answer 1

You can do it in the following way

NSArray *arrSplit = [s componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
                s = [arrSplit componentsJoinedByString:@"\n"];

Hope it may help you..

Answer 2

You might use NSRegularExpression. This is the most simple and elegant way:

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\n+" options:0 error:NULL];
NSString *newString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@"\n"];

Answer 3

For anyone looking for an Updated Swift 4 Answer:

extension String {

   func removeMultipleNewlinesFromMiddle() -> String {
       let returnString = trimmedString.replacingOccurrences(of: "\n+", with: "\n", options: .regularExpression, range: nil)
       return (returnString)
   }
}

Usage :

let str = "Hello \n\n\nWorld \n\nHow are you\n?"
print (str.removeMultipleNewlinesFromMiddle())

Output :

Hello

World

How are you

?