Cut and replace in javascript string

Question

I got the following string:

"14-10-2013 03:04"

And I would like a function which replaces the part where the '10' is now, with the part where the '14' is now. How can I do so? I know there is something like split but I'm not too experienced with it.

So far:

var string = '14-10-2013 03:04';
var firstPart = string.split("-", 1);
alert(firstPart);

But I don't know how to get the second part (the '10') in a variable.

show us your attempt. And what's your expected output?

Rohit Jain
– Rohit Jain

2013-10-14 07:24:29 +00:00
Commented Oct 14, 2013 at 7:24 — Rohit Jain
– Rohit Jain, Commented Oct 14, 2013 at 7:24
Updated the main post.

Anoniem Anoniem
– Anoniem Anoniem

2013-10-14 07:28:27 +00:00
Commented Oct 14, 2013 at 7:28 — Anoniem Anoniem
– Anoniem Anoniem, Commented Oct 14, 2013 at 7:28

SheetJS · Accepted Answer · 2013-10-14 07:46:12Z

2

For the particular string format (converting "xx-yy-..." to "yy-xx-..."), a simple replace will do:

"14-10-2013 03:04".replace(/(\d\d)-(\d\d)/,"$2-$1")

Explanation:

The regular expression /(\d\d)-(\d\d)/ matches two digits, followed by a dash, followed by two more digits. The parentheses denote capture groups which can be referenced in the second argument. In this case, for the string "14-10-2013 03:04", the substring "14-10" matches the regular expression and the two captured texts are "14" and "10".

In the second argument, use $1, $2, ... to specify where the captured text should be inserted. In this case, "$2-$1" will write the second captured text (14), followed by a dash, followed by the first captured text (10).

For more information, see the MDN Documentation on String.prototype.replace.

edited Oct 14, 2013 at 7:46

answered Oct 14, 2013 at 7:27

SheetJS

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3 Comments

Udit Bhardwaj Over a year ago

@Nirk can you edit your answer and give little explanation on the regular expressions you used. That can be helpful for others who are beginners (like me :)) and if they are referring to this question in future for similar kind of problem

SheetJS Over a year ago

@UDB I edited my answer. Let me know if something is unclear

Udit Bhardwaj Over a year ago

@Nirk thanks for edit and explanation, the solution is more clear now to me.

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