CODEWITHSUNDEEP
javascriptregexreplace
billy jean
billy jean

Reputation: 1419

strip two named querystring params from url using regex and replace in javascript

I have a url like:

http://example.org/someparam=asdfadfsadf&lmnop=Lasda:sdf&radParam=dfadfs&qrstu=asfasdf:asaasd

I have this regex:

/(&|\?)(lmnop|qrstu)=.*?(&|$)/

But I want to match both not just the first?

The desired result is the url with the two querystring params and their values removed:

http://example.org/someparam=asdfadfsadf&radParam=dfadfs

Upvotes: 0

Views: 39

Answers (1)

user7571182
user7571182

Reputation:

1st approach without using regex:

Proposed Idea:

1. Split the string on & symbol.
2. Filter out those elements of the split string in step 1 which starts with lmnop= or qrstu=.
3. Join again on & symbol.

Please find the sample implementation below:

let string = `http://example.org/someparam=asdfadfsadf&lmnop=Lasda:sdf&radParam=dfadfs&qrstu=asfasdf:asaasd`;
console.log(
// Step 1
string.split("&").
// Step 2
filter(el => !(el.startsWith("lmnop=") || el.startsWith("qrstu="))).
// Step 3
join("&")
);

2nd Approach Using regex:

You may try:

&(?:lmnop|qrstu)=(.*?)(?=&|$)

Explanation of the above regex:

  • & - Matches & literally.
  • (?:lmnop|qrstu) - Represents a non-capturing group matching lmnop or qrstu.
  • = - Matches = literally.
  • (.*?) - Lazily matches everything till the end or &.
  • (?=&|$) - Represents a positive look-ahead which asserts end or &.

You can find the demo of the above regex in here.

Pictorial Representation

const regex = /&(?:lmnop|qrstu)=(.*?)(?=&|$)/gm;
const str = `http://example.org/someparam=asdfadfsadf&lmnop=Lasda:sdf&radParam=dfadfs&qrstu=asfasdf:asaasd`;
const subst = ``;

// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);

console.log(result);

Upvotes: 2

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