Move around parts of string

Question

Say I have a string:

var mystring = "01/27/2016";

I want then to check if that string contains /:

if(mystring.match("/")){
//Then transform "01/27/2016" to "2016-01-27"
}

How could I achieve it? Best Regards

Split the string ([`.split("/")`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/split)) and check the length of the array. If there is only one element in the array then there is no `/` in the string. Otherwise you have the individual date parts to create a string in the required format. — Andreas, Mar 11 '16 at 13:44
Possible duplicate of [Replacing all occurrences of a string in JavaScript](http://stackoverflow.com/questions/1144783/replacing-all-occurrences-of-a-string-in-javascript) — Hatchet, Mar 11 '16 at 13:44

Nina Scholz · Accepted Answer · 2016-03-11T17:22:25.027

2

You may use String#replace:

/(\d+)\/(\d+)\/(\d+)/gi

1st Capturing group (\d+)

\d+ match a digit [0-9]

Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

\/ matches the character / literally

2nd Capturing group (\d+)

\d+ match a digit [0-9]

Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

\/ matches the character / literally

3rd Capturing group (\d+)

\d+ match a digit [0-9]

Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

// is replacing
document.write('01/27/2016'.replace(/(\d+)\/(\d+)\/(\d+)/gi, '$3-$1-$2') + '<br>');

// is not replacing
document.write('01.27.2016'.replace(/(\d+)\/(\d+)\/(\d+)/gi, '$3-$1-$2') + '<br>');

edited Mar 11 '16 at 17:22

answered Mar 11 '16 at 13:44

Nina Scholz

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But edit to also check if string contains "/". because some strings does not:) – user1665355 Mar 11 '16 at 13:46
@user1665355, it checks. – Nina Scholz Mar 11 '16 at 13:49
the question is to check if there is a slash in it **and** then rebuild the string with dashes. if no slasches, then nothing should happen (so my interpretation of the question). – Nina Scholz Mar 11 '16 at 14:11

isvforall · Answer 2 · 2016-03-11T14:02:58.607

Solution without regex and with split method

var mystring = "01/27/2016";
var t = mystring.split('/')
var res = t[2] + '-' + t[0] + '-' + t[1];
document.write('<pre>' + JSON.stringify(res,0,2) + '</pre>');

Another solution using Array#join function

var mystring = "01/27/2016";
var t = mystring.split('/')
var res = [t[2], t[0], t[1]].join('-');
document.write('<pre>' + JSON.stringify(res,0,2) + '</pre>');

score 0 · Answer 3 · answered Mar 11 '16 at 13:45

0

You can do this:

var myString = "01/27/2016";

if(myString.match("/")) {
  var array = myString.split("/");
  myString = array[2] + "-" + array[0] + "-" + array[1];
}

document.write(myString);

answered Mar 11 '16 at 13:45

Pierre C.

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score 0 · Answer 4 · answered Mar 11 '16 at 13:47

In you want to check if your string contains some char or another string use https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf

in your example

 if(mystring.indexOf('/') > -1){
   //Then transform "01/27/2016" to "2016-01-27"
   }

Joaquinglezsantos · Answer 5 · 2016-03-11T14:17:22.093

0

I recommend use the library moment.js

If you want change date formats MM/DD/YYYY to YYYY-MM-DD

var mystring = "01/27/2016",
    dateformatted = moment(mystring,'MM/DD/YYYY').format('YYYY-MM-DD')

edited Mar 11 '16 at 14:17

answered Mar 11 '16 at 14:06

Joaquinglezsantos

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Move around parts of string

5 Answers5