Add a space between each character

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Add a space between each character

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#1 by (5 votes)

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I try to separate the characters of a String by spaces using a regular expression. That is, 111 results 1 1 1 or ABC results A B C and the output should be a string.

String nombre = "111";
nombre = nombre.replaceAll("\ˆ\w\s", nombre);

Expected result: "1 1 1" ;

java string regex

asked by Gdaimon 25.03.2018 в 16:17

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1 answer

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score 5 · Accepted Answer

Replacing in the positions that are neither the beginning nor the end of the text:

texto = texto.replaceAll("(?!^|$)", " ");

Or, without regex (eliminating any space you have at the beginning / end):

texto = texto.replace("", " ").trim();

Or, leading to the generalized form to separate each N characters:

final int cadaN = 2;
final String separarCon = " ";

String texto = "probando!";

texto = texto.replaceAll("(?s).{" + cadaN + "}(?!$)", "$0" + separarCon);


System.out.println(texto);

pr ob an do !

since it matches the N characters, provided that it is not followed by the end of the text (?!$) , and replaces it so it coincided $0 followed by the space. The (?s) mode is so you can also match line breaks, if any.