Validate JSON String using REGEX in JSONAssert java

Question

I am storing my expected json string in the json file under resources as shown below. The json string consists of regular expression. I am using JSONAssert Library to compare two json strings.

{
  "timestamp": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}.\\d{3}+\\d{4}$",
  "status": 415,
  "error": "Unsupported Media Type",
  "message": "Content type 'text/plain;charset=ISO-8859-1' not supported",
  "path": "/service/addUser"
}

My actual response consists of timestamp in this format 2018-11-13T04:10:11.233+0000

    JSONAssert.assertEquals(getJsonBody(expected), response.asString(),false);

Is always giving the below error on the regular expression

java.lang.AssertionError: timestamp
 Expected: ^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}+\d{4}$
      got: 2018-11-13T04:12:55.923+0000

Any recommendation on this error?

instead of comparing values, you should do something like assertTrue(response.asString().matches(expected)) — Kartik
– Kartik, Commented Nov 13, 2018 at 4:19
Your regular expression is incorrect - dot and plus have special meaning and must be escaped. Try ^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}\+\d{4}$ — D.B.
– D.B., Commented Nov 13, 2018 at 4:23
I have added this regex [0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\\.[0-9]{3}\\+[0-9]{4} but didnt worked — Vikram
– Vikram, Commented Nov 13, 2018 at 4:53
@Kartik I got some pattern matcher exception. Let me fix that — Vikram
– Vikram, Commented Nov 13, 2018 at 4:57

Kartik · Accepted Answer · 2018-11-13 05:08:38Z

You are comparing the pattern with the timestamp string. What you actually need to do is check if the timestamp matches the pattern.

Try this code:-

String expected = "{\n" +
        "  \"timestamp\": \"^\\\\d{4}-\\\\d{2}-\\\\d{2}T\\\\d{2}:\\\\d{2}:\\\\d{2}\\\\.\\\\d{3}\\\\+\\\\d{4}$\",\n" +
        "  \"status\": 415,\n" +
        "  \"error\": \"Unsupported Media Type\",\n" +
        "  \"message\": \"Content type 'text/plain;charset=ISO-8859-1' not supported\",\n" +
        "  \"path\": \"/service/addUser\"\n" +
        "}";
String actual = "{\n" +
        "  \"timestamp\": \"2018-11-13T04:12:55.923+0000\",\n" +
        "  \"status\": 415,\n" +
        "  \"error\": \"Unsupported Media Type\",\n" +
        "  \"message\": \"Content type 'text/plain;charset=ISO-8859-1' not supported\",\n" +
        "  \"path\": \"/service/addUser\"\n" +
        "}";
JSONAssert.assertEquals(
        expected,
        actual,
        new CustomComparator(
                JSONCompareMode.LENIENT,
                new Customization("***", new RegularExpressionValueMatcher<>())
        )
);

So with your code, it will look something like:-

JSONAssert.assertEquals(
        getJsonBody(expected),
        response.asString(),
        new CustomComparator(
                JSONCompareMode.LENIENT,
                new Customization("***", new RegularExpressionValueMatcher<>())
        )
);

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