javascript regex- replace all instances with one

Question

I want to replace all the words XXX/XXX/XXX/... with one XXX/

For example:

www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX

should be:

www.domain.com/XXX/section/XXX

How can i do it with regex instead of:

str.replace("XXX/XXX","XXX").replace("XXX/XXX","XXX").replace("XXX/XXX","XXX").replace("XXX/XXX","XXX").replace("XXX/XXX","XXX").replace("XXX/XXX","XXX");

Thanks

Bamieh · Accepted Answer · 2017-08-01 06:36:40Z

2

Solution

const input = "www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX";

const expectedOutput = "www.domain.com/XXX/section/XXX"
const actualOutput = input.replace(/(\/XXX)\1+/g, "$1")

console.log("output", actualOutput)

Explanation

the () will capture the match inside the parenthesis.

the \1 and $1 will use whats captured inside the first capture group, the /XXX in our case.

the + will ask for 1 or more repeats.

the g flag will cause the regex to be applied on the whole string, even if a match is found earlier.

the whole regex will look for an /XXX followed by another /XXX 1 or more times, then replacing whats matched with only one "/XXX".

edited Aug 1, 2017 at 6:36

answered Aug 1, 2017 at 6:28

Bamieh

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Bamieh · Accepted Answer · 2017-08-01 06:33:34Z

2

You can use regular expression to match all occurrences of /XXX that are repeated 2 or more times in a row:

var str = "www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX";

var strOut = str.replace(/(\/XXX){2,}/g, '$1');

console.log(strOut);

edited Aug 1, 2017 at 6:33

Bamieh

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answered Aug 1, 2017 at 6:27

marekful

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Comments

Titus · Accepted Answer · 2017-08-01 06:26:11Z

1

Try this:

var str = "www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX";
str = str.replace(/(XXX\/*)+/g, "XXX/");
console.log(str);

answered Aug 1, 2017 at 6:26

Titus

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Sourabh Somani · Accepted Answer · 2017-08-01 06:28:50Z

1

Try this

var url="www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX";
var regexer=/(XXX\/*)+/g;
url = url.replace(regexer, "XXX/");
console.log(url)

answered Aug 1, 2017 at 6:28

Sourabh Somani

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SLePort · Accepted Answer · 2017-08-01 06:48:11Z

1

To capture and output only first occurrence of XXX/*:

var url="www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX";
var re=/(XXX\/*)+/g;
url = url.replace(re, "$1");
console.log(url)

edited Aug 1, 2017 at 6:48

answered Aug 1, 2017 at 6:37

SLePort

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Sébastien Helbert · Accepted Answer · 2017-08-01 08:33:37Z

1

Try:

function processUrl(url) {
  return url.replace(/www.domain.com(\/[^/]*)*\/section(\/[^/]*)*/g, "www.domain.com$1/section$2");
}
console.log(processUrl("www.domain.com/XXX/XXX/XXX/XXX/XXX/section/XXX/XXX"));
console.log(processUrl("www.domain.com/XXX/XXX/XXX/XXX/XXX/section/YYY/YYY"));
console.log(processUrl("www.domain.com/XXX/XXX/XXX/XXX/section/ZZZ/ZZZ/ZZZ"));

edited Aug 1, 2017 at 8:33

answered Aug 1, 2017 at 6:29

Sébastien Helbert

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