Requirements:
For each Json field where key matches specified constant replace value with another constant.
{"regular":"a", "sensitive":"b"}
Parameters "sensitive", "*****". Expected:
{"regular":"a", "sensitive":"*****"}
Values may, or may not have double quotes around them. Replacement constant is double quouted always. Json may be malformed. Java implementation preferably.
Key comparison is case insensitive.
Depending on how malformed your "JSON" is, the following might work - if not, we need more test cases:
"sensitive"\s*:\s* # match "sensitive":
( # capture in group 1:
"[^"]*" # any quoted value
| # or
[^\s,{}"]* # any unquoted value, ending at a comma, brace or whitespace
) # end of group 1
In Java:
String resultString = subjectString.replaceAll(
"(?x)\"sensitive\"\\s*:\\s* # match \"sensitive\":\n" +
"( # capture in group 1:\n" +
" \"[^\"]*\" # any quoted value\n" +
"| # or\n" +
" [^\\s,{}\"]* # an unquoted value, ending at comma, brace or whitespace\n" +
") # end of group 1",
"\"sensitive\":\"******\"");
Test it live on regex101.com.
You can use positive lookbehind to achieve this :
public static void main(String[] args) {
String s = "{\"regular\":\"a\", \"sensitive\":\"b\"}";
String key = "sensitive";
String val = "****";
System.out.println(s.replaceAll("(?<=\"" + key + "\":\")(\\w+)", val));
key = "regular";
System.out.println(s.replaceAll("(?<=\"" + key + "\":\")(\\w+)", val));
}
O/P :
{"regular":"a", "sensitive":"****"}
{"regular":"****", "sensitive":"b"}
You can use the following regex:
String t= "{\"regular\":\"a\", \"sensitive\":\"b\"}"; //{"regular":"a", "sensitive":"b"}
String r = t.replaceAll("(\\s*)\"?sensitive\"?\\s*:\\s*\"?b\"?\\s*", "$1\"sensitive\":\"*****\"");
System.out.println("output "+r); //output {"regular":"a", "sensitive":"*****"}
t= "{\"regular\":\"a\",sensitive:b}"; //{"regular":"a", "sensitive":"b"}
r = t.replaceAll("(\\s*)\"?sensitive\"?\\s*:\\s*\"?b\"?\\s*", "$1\"sensitive\":\"*****\"");
System.out.println("output "+r); //output {"regular":"a","sensitive":"*****"}
