Javascript - match Regex for this date represenation

Question

How can I write a proper regex for:

/Date(1518238800000)/ - matches

jdsjdsj - no match

2017/03/12 - no match

12 - no match

Date() - no match

/Date(1218238800000)/ - matches

What I have so far is:

var res = str.match(/Date(\d*)/g);

How can I amend the regex to work?

There is no "JSON date" either. How is this related to JSON at all? — str, Mar 04 '18 at 17:24
I cannot store a Date Object as a json literal, only '/Date(XXXXXXX)/ — Jebathon, Mar 04 '18 at 17:25
`JSON.stringify({date:new Date()})` produces something like `{"date":"2018-03-04T17:27:00.609Z"}`. That is usually how you use dates within JSON. — str, Mar 04 '18 at 17:27
To people who do not like the word JSON, then read "serializer" — mplungjan, Mar 04 '18 at 17:52
@str this representation is common in ASP.NET MVC. If you have not heard about it does not mean it does not exist. — Salman A, Mar 04 '18 at 17:56
@SalmanA JSON is language-agnostic and this question is tagged with JavaScript. — str, Mar 04 '18 at 17:59
@str If OP posts the complete string, perhaps you will be happy. It is likely ASP.NET JSON which serializes DateTime to the following format `"/Date(1251877601000)/".` — mplungjan, Mar 04 '18 at 18:01
https://stackoverflow.com/questions/1367899/how-to-parse-asp-net-json-date-format-with-gwt — mplungjan, Mar 04 '18 at 18:03
@BDillan I know now after having to defend OPs use of the word JSON ;) — mplungjan, Mar 04 '18 at 18:09

mplungjan · Accepted Answer · 2018-03-04T18:03:56.757

1

I assume your string is a bit from a .NET serializer as mentioned here

How to parse ASP.NET JSON Date format with GWT

and

How to parse JSON to receive a Date object in JavaScript?

One of the answers have a reviver function you may want to use.

If not then the regex will need to have the parenthesis escaped:

var str = '{ "date": "/Date(1218238800000)/" }'
var re = /Date\((\d*)\)/g // escaping the () from the date and capture the number
res = re.exec(str);

console.log(res[1])

More dates and create date object:

var str = '{ "date1": "/Date(1218238800000)/", "date2": "/Date(1218248800000)/" }'
var re = /Date\((\d*)\)/g // escaping the () from the date and capture the number

while (res = re.exec(str)) {
  var date = +res[1]; // convert
  console.log(new Date(date)) 
}

edited Mar 04 '18 at 18:03

answered Mar 04 '18 at 17:29

mplungjan

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But that is not JSON. – str Mar 04 '18 at 17:45
But likely what OP meant – mplungjan Mar 04 '18 at 17:46
We should not encourage things like this. Either the terminology or the use of 'JSON' is completely wrong. – str Mar 04 '18 at 17:46
1

@str Many names for such things. Likely the output of .NET https://stackoverflow.com/questions/4511705/how-to-parse-json-to-receive-a-date-object-in-javascript – mplungjan Mar 04 '18 at 17:49
But it is still not valid JSON. `{ "date": "Date(1218238800000)" }` would be though. – str Mar 04 '18 at 17:59
OP is receiving something like this `{"date":"\/Date(1518238800000)\/"}` (which is valid JSON)... you might want to tweak your answer a little. – Salman A Mar 04 '18 at 18:02
@SalmanA Tweaked – mplungjan Mar 04 '18 at 18:06

score 0 · Answer 2 · answered Mar 04 '18 at 17:31

0

You need to escape the special characters like this:

let regex = /\/Date\(\d+\)\//g;
console.log(regex.test("/Date(123455)/"), //true
  regex.test("Date()"), //false
  regex.test("afdjkh"), //false
  regex.test("/Date(38457843)/")) //true

answered Mar 04 '18 at 17:31

vityavv

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Javascript - match Regex for this date represenation

2 Answers2