Add Separator to String at Every N Characters

Add separator to string at every N characters?

Regex.Replace(myString, ".{8}", "$0,");

If you want an array of eight-character strings, then the following is probably easier:

Regex.Split(myString, "(?<=^(.{8})+)");

which will split the string only at points where a multiple of eight characters precede it.

Add separator to string at every N characters Android?

Hello try below regular expression,

String s = "1234567890";
s = s.replaceAll("(.{3})", "$1:");
System.out.println(s);

Update:
Updated the answer, if you don't want to insert ':' at the end,

String s = "123456789";
s = s.replaceAll("...(?!$)", "$0:");
System.out.println(s);

"..." is the length. Which you can change if you want to. So if you want 84:F3:EB:34:75:6B like this as the output of 84F3EB34756B then use,

s = s.replaceAll("..(?!$)", "$0:");

How to insert a space into a string, between every 4 characters?

Assuming that it's fine to work from right-to-left, this should do the trick:

displaynum_lbl.Text = System.Text.RegularExpressions.Regex.Replace(printClass.mynumber.ToString(), ".{4}", "$0 ");

You can find that and a good deal more information in other StackOverflow answers, example: Add separator to string at every N characters?

How add separator to string at every N characters in swift?

Swift 5.2 • Xcode 11.4 or later

extension Collection {

    func unfoldSubSequences(limitedTo maxLength: Int) -> UnfoldSequence<SubSequence,Index> {
        sequence(state: startIndex) { start in
            guard start < endIndex else { return nil }
            let end = index(start, offsetBy: maxLength, limitedBy: endIndex) ?? endIndex
            defer { start = end }
            return self[start..<end]
        }
    }

    func every(n: Int) -> UnfoldSequence<Element,Index> {
        sequence(state: startIndex) { index in
            guard index < endIndex else { return nil }
            defer { let _ = formIndex(&index, offsetBy: n, limitedBy: endIndex) }
            return self[index]
        }
    }

    var pairs: [SubSequence] { .init(unfoldSubSequences(limitedTo: 2)) }
}

---

extension StringProtocol where Self: RangeReplaceableCollection {

    mutating func insert<S: StringProtocol>(separator: S, every n: Int) {
        for index in indices.every(n: n).dropFirst().reversed() {
            insert(contentsOf: separator, at: index)
        }
    }

    func inserting<S: StringProtocol>(separator: S, every n: Int) -> Self {
        .init(unfoldSubSequences(limitedTo: n).joined(separator: separator))
    }
}

---

Testing

let str = "112312451"

let final0 = str.unfoldSubSequences(limitedTo: 2).joined(separator: ":")
print(final0)      // "11:23:12:45:1"

let final1 = str.pairs.joined(separator: ":")
print(final1)      // "11:23:12:45:1"

let final2 = str.inserting(separator: ":", every: 2)
print(final2)      // "11:23:12:45:1\n"

var str2 = "112312451"
str2.insert(separator: ":", every: 2)
print(str2)   // "11:23:12:45:1\n"

var str3 = "112312451"
str3.insert(separator: ":", every: 3)
print(str3)   // "112:312:451\n"

var str4 = "112312451"
str4.insert(separator: ":", every: 4)
print(str4)   // "1123:1245:1\n"

How to insert a character every N characters in a string in C++

std::string tokenize(const std::string& s) {
   if (!s.size()) {
     return "";
   }
   std::stringstream ss;
   ss << s[0];
   for (int i = 1; i < s.size(); i++) {
     ss << '|' << s[i];
   }
   return ss.str();
}

How to add substring as separator to paragraph after every N words

You convert the string to an array, and then use map to add the separator:

extension String {
    func add(separator: String, afterNWords: Int) -> String {
        return split(separator: " ").enumerated().map { (index, element) in
            index % afterNWords == afterNWords-1 ? "\(element) \(separator)" : String(element)
        }.joined(separator: " ")
    }
}

//Usage:

let result = paragraph.add(separator: "$$$$", afterNWords: 3)

Putting char into a java string for each N characters

Something like:

public static String insertPeriodically(
    String text, String insert, int period)
{
    StringBuilder builder = new StringBuilder(
         text.length() + insert.length() * (text.length()/period)+1);

    int index = 0;
    String prefix = "";
    while (index < text.length())
    {
        // Don't put the insert in the very first iteration.
        // This is easier than appending it *after* each substring
        builder.append(prefix);
        prefix = insert;
        builder.append(text.substring(index, 
            Math.min(index + period, text.length())));
        index += period;
    }
    return builder.toString();
}

How can I insert a character after every n characters in javascript?

function chunk(str, n) {
    var ret = [];
    var i;
    var len;

    for(i = 0, len = str.length; i < len; i += n) {
       ret.push(str.substr(i, n))
    }

    return ret
};

chunk("The quick brown fox jumps over the lazy dogs.", 5).join('$');
// "The q$uick $brown$ fox $jumps$ over$ the $lazy $dogs."

How do you split a string at every n-th character in Swift?

Implement this function

extension String {
    func inserting(separator: String, every n: Int) -> String {
        var result: String = ""
        let characters = Array(self.characters)
        stride(from: 0, to: characters.count, by: n).forEach {
            result += String(characters[$0..<min($0+n, characters.count)])
            if $0+n < characters.count {
                result += separator
            }
        }
        return result
    }
}

call it this way,

let str = "XQQ230IJFEKJLDSAIOUOIDSAUIFOPDSFE28"
let final = str.inserting(separator: " ", every: 8)
print(final)

Output will be like this,

XQQ230IJ FEKJLDSA IOUOIDSA UIFOPDSF E28

This will be generic solution if you want to add any character instead of space, it will work.

---

Related Topics