replaceAll Java method to remove "\\n" from String

Question

I have a simple treatement but I'm stuck

I have something like

"\"iVBORw0KGgoAAAANSUhEUgAAAwoAAADwCAYAAACg2ZPDAAAABHNCSVQICAgIfAhkiAAAIABJREFU\\neJzt3XecXVW99";

public static void main(String[] args) {
        String value = "\"iVBORw0KGgoAAAANSUhEUgAAAwoAAADwCAYAAACg2ZPDAAAABHNCSVQICAgIfAhkiAAAIABJREFU\\neJzt3XecXVW99";
        String filtre1 = value.replaceAll("\"", "");
        String filtre2 = filtre1.replaceAll("\\n", "");
        System.out.println(filtre2);

    }

the result is .. I have always "\n" I want to remove it

iVBORw0KGgoAAAANSUhEUgAAAwoAAADwCAYAAACg2ZPDAAAABHNCSVQICAgIfAhkiAAAIABJREFU\neJzt3XecXVW99

You remove a `\` so it stays `\n` and then try to remove `\\n` but does not exist ... — azro, Mar 29 '18 at 22:04
Don't use replaceAll to replace substrings. Use replace(). replaceAll() expects a regexp, not a substring. — JB Nizet, Mar 29 '18 at 22:06

f14284 · Accepted Answer · 2018-03-29T22:07:10.423

3

Maybe:

String filtre2 = filtre1.replaceAll("\\n", "");

need to be :

String filtre2 = filtre1.replaceAll("\\\\n", "");

(sorry i cannot just add comment)

edited Mar 29 '18 at 22:07

answered Mar 29 '18 at 22:06

f14284

141
4

Or `filtre1.replace("\\n", "")` – shmosel Mar 29 '18 at 22:07
Or `filtre1.replaceAll(Pattern.quote("\\n"), "")` (which is effectively what `replace` does internally, expect that `replace` also escapes the replacement). – Andy Turner Mar 29 '18 at 22:09

score 1 · Answer 2 · answered Mar 29 '18 at 22:07

You could try this:

public static void main(String[] args) {
    String value = "\"iVBORw0KGgoAAAANSUhEUgAAAwoAAADwCAYAAACg2ZPDAAAABHNCSVQICAgIfAhkiAAAIABJREFU\\neJzt3XecXVW99";
    String filtre1 = value.replaceAll("\"", "");
    String filtre2 = filtre1.replaceAll("\\\\n", "");
    System.out.println(filtre2);

}

score 1 · Answer 3 · answered Mar 29 '18 at 22:12

You basically have two choices, both of which are in the below code:

public static void main(String[] args) {
    String value = "\"iVBORw0KGgoAAAANSUhEUgAAAwoAAADwCAYAAACg2ZPDAAAABHNCSVQICAgIfAhkiAAAIABJREFU\\neJzt3XecXVW99";
    System.out.println(value.replace("\"", "").replace("\\n", ""));
    System.out.println(value.replaceAll("\"|\\\\n", ""));
}

replaceAll Java method to remove "\\n" from String

3 Answers3

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