How to replace all backward slahes in java

Question

I have a String which consists of backward slashes .

public static void main(String[] args) {

        String str = "\"json_value\": \"{\\\"screen\\\":\\\"SCR-3\\\",\\\"price\\\":\\\"200\\\",\\\"count\\\":\\\"0\\\",\\\"name\\\":\\\"Regular Cup, Delishy 50 Ml\\\",\\\"seat_num\\\":\\\"D12\\\",\\\"image\\\":\\\"http://192.168.2.46:8080/OrderSnacks/JSON_images/icecream_cup_vanilla.jpg\\\",\\\"quantity\\\":\\\"2\\\",\\\"orderid\\\":\\\"14070738\\\",\\\"itemid\\\":\\\"57\\\",\\\"vendor_id\\\":\\\"10101500072001001\\\",\\\"date_time\\\":\\\"13:07:38\\\",\\\"toppings\\\":[{\\\"name\\\":\\\"Quantity      1\\\",\\\"value\\\":[\\\"Honey with Chocolate Sauce  10 ML\\\"]},{\\\"name\\\":\\\"Quantity      2\\\",\\\"value\\\":[\\\"Honey with Chocolate Sauce  10 ML\\\"]}]}\",";


        str =   str.replaceAll("\\\\", "\\\\\\\\");

        System.out.println(str);

    }

Could anybody please let me know how to replace all backward slashes ??

I tried using str = str.replaceAll("\\", "\\\\"); , but its not replacing them .

See http://stackoverflow.com/questions/1701839/string-replaceall-with-backslashes-error. — Mihai8, Jul 07 '14 at 09:06
Well, this replaceAll does replace each \ with \\. So what...? — laune, Jul 07 '14 at 09:09
The syntax is: `public String replaceAll(String regex, String replacement)`, therefore `"\\\\\\\\"` is not right. Maybe just `""` for the replacement? — pzaenger, Jul 07 '14 at 09:09
@user974802 Perhaps you can learn to distinguish "replace" and "remove"? Certainly, "replacing some substring with the empty string" is "removing the substring", but you didn't say that. — laune, Jul 07 '14 at 09:14

score 1 · Answer 1 · answered Jul 07 '14 at 09:10

1

str =   str.replaceAll("\\\\", "");

Where is the problem???

answered Jul 07 '14 at 09:10

laune

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score 1 · Accepted Answer · answered Jul 07 '14 at 09:12

  String str = "\"json_value\": \"{\\\"screen\\\":\\\"SCR-3\\\",\\\"price\\\":\\\"200\\\",\\\"count\\\":\\\"0\\\",\\\"name\\\":\\\"Regular Cup, Delishy 50 Ml\\\",\\\"seat_num\\\":\\\"D12\\\",\\\"image\\\":\\\"http://192.168.2.46:8080/OrderSnacks/JSON_images/icecream_cup_vanilla.jpg\\\",\\\"quantity\\\":\\\"2\\\",\\\"orderid\\\":\\\"14070738\\\",\\\"itemid\\\":\\\"57\\\",\\\"vendor_id\\\":\\\"10101500072001001\\\",\\\"date_time\\\":\\\"13:07:38\\\",\\\"toppings\\\":[{\\\"name\\\":\\\"Quantity      1\\\",\\\"value\\\":[\\\"Honey with Chocolate Sauce  10 ML\\\"]},{\\\"name\\\":\\\"Quantity      2\\\",\\\"value\\\":[\\\"Honey with Chocolate Sauce  10 ML\\\"]}]}\",";


  str =   str.replaceAll("\\\\", "");

  System.out.println(str);


 output: 


 "json_value": "{"screen":"SCR-3","price":"200","count":"0","name":"Regular Cup, Delishy 50 Ml","seat_num":"D12","image":"http://192.168.2.46:8080/OrderSnacks/JSON_images/icecream_cup_vanilla.jpg","quantity":"2","orderid":"14070738","itemid":"57","vendor_id":"10101500072001001","date_time":"13:07:38","toppings":[{"name":"Quantity      1","value":["Honey with Chocolate Sauce  10 ML"]},{"name":"Quantity      2","value":["Honey with Chocolate Sauce  10 ML"]}]}",

SparkOn · Answer 3 · 2014-07-07T09:31:12.107

1

As replaceAll() treats the first argument as regex so you must double to escape the backslash

str = str.replaceAll("\\\\", "");

\ is a special char in java while using it in string.So to treat \ as normal character you need to place another \ to turn off its special meaning in regex. So to write \\ in regex you need to write it with four \

edited Jul 07 '14 at 09:31

answered Jul 07 '14 at 09:15

SparkOn

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How to replace all backward slahes in java

3 Answers3