removing duplicates in a string using javascript

Question

I have a string like the one given below.

String1 = "a,b,,,c"

I want to replace the commas occuring in the middle with a single comma i.e. remove duplicate values.How would I do it.

I was able to remove the duplicates at the end of the String using the follwoing expression.str = str.replace(/,+$/, ","); How do i do it in the middle of the String? — sathish kumar
– sathish kumar, Commented Nov 28, 2013 at 10:43

Andrew · Accepted Answer · 2013-11-28 10:44:46Z

1

Try this:

str.replace(/[,]{2,}/g, ',')

http://jsfiddle.net/bnQt4/

answered Nov 28, 2013 at 10:44

Andrew

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2 Comments

sathish kumar Over a year ago

I have a doubt.what does {2,} do in the above expression?

gwillie Over a year ago

@sathishkumar it means match it 2 or more times

Toto · Accepted Answer · 2013-11-28 10:47:08Z

0

How about:

String1.replace(/,+/g, ',');

answered Nov 28, 2013 at 10:47

Toto

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Comments

anubhava · Accepted Answer · 2013-11-28 10:47:31Z

0

This should work:

string1="a,b,,,c";
repl = string1.replace(/,{2}/g, '');
//=> a,b,c

OR using lookahead:

repl = string1.replace(/,(?=,)/g, '');
//=> a,b,c

answered Nov 28, 2013 at 10:47

anubhava

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Firas Dib · Accepted Answer · 2013-11-28 11:39:41Z

0

Here is something fairly generic that would work for any repeated string: /(.)(?=\1)/g

If you only want commas, simply use /,(?=,)/g

Replace the result with an empty string.

string1 = string1.replace(/,(?=,)/g, '');

Demo: http://regex101.com/r/zA0kQ4

answered Nov 28, 2013 at 11:39

Firas Dib

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