split string in javascript with regex?

Question

I have the following string in javascript,

Id:121,RefId:123,Date:Sep 22, 2012 12:00:00 AM

when i tried to split it into 3 key,value pairs using , as the separator it is giving me wrong out put because in date there is another ,(comma).
So i guess i must use regular expression.
I want to display it as follows;

Id:121   
RefId:123   
Date:Sep 22, 2012 12:00:00 AM

Can anyone please suggest how to overcome the extra comma in date using regular expression?
Thanks in Advance...

“Some people, when faced with a problem think ‘I know; I use regular expressions’. Now they have two problems.” — Joey
– Joey, Commented Sep 22, 2012 at 11:29
How did you got such a string? Its ambiguous format is not easy to handle. Why don't you use JSON, CSV or such? — Bergi
– Bergi, Commented Sep 22, 2012 at 11:41
@Joey: As both our failed attempts to do it without regexes show, sometimes not using a regex causes more problems :) — Tim Pietzcker
– Tim Pietzcker, Commented Sep 22, 2012 at 11:41

xdazz · Accepted Answer · 2012-09-22 11:35:44Z

4

You mean split on the , which is followed not the white space?

'Id:121,RefId:123,Date:Sep 22, 2012 12:00:00 AM  '.split(/,(?=\S)/);
// will give you ["Id:121", "RefId:123", "Date:Sep 22, 2012 12:00:00 AM  "]

answered Sep 22, 2012 at 11:35

xdazz

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GottZ · Accepted Answer · 2012-09-22 11:37:33Z

2

if you really want a regular expression (instead of a limited split) you could do this:

var text = "Id:121,RefId:123,Date:Sep 22, 2012 12:00:00 AM";
text.match(/^(.+?),(.+?),(.+)$/);

answered Sep 22, 2012 at 11:37

GottZ

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5 Comments

Tim Pietzcker Over a year ago

You could use [^,]* instead of .+?, that would be a bit more efficient.

GottZ Over a year ago

[^,] or .+? would not make any difference in assembly but you can choose what you want.

xdazz Over a year ago

@Jan-StefanJanetzky I think Tim means the difference of performance.

GottZ Over a year ago

it would only make a performance difference if there would be more than one char in [^]

Tim Pietzcker Over a year ago

No, that's not correct. Your regex, applied to the test string, takes the regex engine 49 steps until a match is achieved instead of 10 steps that my regex would take. By making the + quantifier lazy, you force the regex engine to backtrack after each character. This is even worse if the input string cannot be matched. If I take out the second and third comma from the string, your regex takes 248 steps to figure out a non-match, mine takes 8.

Brad Lord · Accepted Answer · 2012-09-22 11:42:05Z

2

If you would like to use a regular expression, you can try this:

re = /^Id:(\d+),RefId:(\d+),Date:(.+)/
matches = re.exec("Id:121,RefId:123,Date:Sep 22, 2012 12:00:00 AM")
matches[1] // "121"
matches[2] // "123"
matches[3] // "Sep 22, 2012 12:00:00 AM"

answered Sep 22, 2012 at 11:42

Brad Lord

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