CODEWITHSUNDEEP
rregexstring
M L
M L

Reputation: 116

How to limit character repetition in a word to 2?

I want to remove characters that repeat more than twice in a word. For example

 "hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day"

to

 "hhaappyy mmoorning friendss, good good day"

I have tried something like this, but it is not reducing to exactly 2 repetitions.

gsub('([[:alpha:]])\\1{2}', '\\1', 
   'hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day')

#[1] "hhappyyy mmoorning friendsssss, good god day"

Thank you.

Upvotes: 4

Views: 228

Answers (4)

Sam
Sam

Reputation: 1

package test.com;

public class limitCharCount {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    String str = "gggkjjkjkjjjjjsssslklkkkkkk";

    char ch[] = str.toCharArray();
    String Test = "";
    //int count = 2;
    for (int i = 0; i < ch.length - 1; i++) {
        if (i == 0 ||i == 1)
            Test = Test + ch[i];
        else if (!(ch[i]==ch[i-1] && ch[i]==ch[i-2]) )
        {
            Test = Test + ch[i];
        }

    }

System.out.println(Test); }

} output ::ggkjjkjkjjsslklkk

Upvotes: 0

adn bps
adn bps

Reputation: 639

fwiw, here is another solution:

f = function(x){
    x = strsplit(x, '')[[1]]
    x = rle(x)
    x = rep(x$values, pmin(2, x$lengths))
    paste(x, collapse='')
}

example:

x = "hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day"
f(x)
[1] "hhaappyy mmoorning friendss, good good day"

however, gsub is a little easier...

Upvotes: 1

A. Denis
A. Denis

Reputation: 562

Same as from Wiktor Stribiżew, but in javascript and replace every character (numbers, punctuation also), if you need this.

var sInput = "hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day";
var sOutput = sInput.replace(/(.)\1{2,}/g, "$1$1");
console.log(sOutput);

Upvotes: 1

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626728

You need to use {2,} quantifier and use two \1 in the replacement:

s<-'hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day'
gsub('([[:alpha:]])\\1{2,}', '\\1\\1', s)
# => [1] "hhaappyy mmoorning friendss, good good day"

See the R demo.

The ([[:alpha:]])\\1{2,} pattern matches and captures a letter into Group 1 and then 2 or more repetitions of the same char are matched. Two \1 in the replacement pattern replace the whole match with 2 occurrences of the char. It is valid to use two \1 placeholders because every match is at least 3 identical chars.

Upvotes: 6

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