Javascript regex to replace numbers in sequence

Question

I am trying to replace numbers in string with the character "X" which works pretty good by replacing every individual number.

This the code:

 let htmlStr = initialString.replace(/[0-9]/g, "X");

So in a case scenario that initialString = "p3d8" the output would be "pXdX"

The aim is to replace a sequence of numbers with a single "X" and not every number (in the sequence) individually. For example:

If initialString = "p348" , with the above code, the output would be "pXXX". How can I make it "pX" - set an "X" for the whole numbers sequence.

Is that doable through regex?

Any help would be welcome

You should read a regexp tutorial, this is one of the most basic patterns. — Barmar
– Barmar, Commented Feb 5, 2019 at 19:48
If you did substantially edit your question or answers did not work for you, please comment and keep community updated. — hc_dev
– hc_dev, Commented Feb 6, 2019 at 10:15

Kamil Kiełczewski · Accepted Answer · 2019-02-05 20:11:32Z

8

Try

let htmlStr = "p348".replace(/[0-9]+/g, "X");
let htmlStr2 = "p348ad3344ddds".replace(/[0-9]+/g, "X");

let htmlStr3 = "p348abc64d".replace(/\d+/g, "X");

console.log("p348           =>",htmlStr);
console.log("p348ad3344ddds =>", htmlStr2);
console.log("p348abc64d     =>", htmlStr3);

In regexp the \d is equivalent to [0-9], the plus + means that we match at least one digit (so we match whole consecutive digits sequence). More info here or regexp mechanism movie here.

edited Feb 5, 2019 at 20:11

answered Feb 5, 2019 at 19:50

Kamil Kiełczewski

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Maheer Ali · Accepted Answer · 2019-02-05 20:12:13Z

3

You can use + after [0-9] It will match any number(not 0) of number. Check Quantifiers. for more info

let initialString = "p345";
let htmlStr = initialString.replace(/[0-9]+/g, "X");
console.log(htmlStr);

edited Feb 5, 2019 at 20:12

answered Feb 5, 2019 at 19:52

Maheer Ali

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3 Comments

Code Maniac Over a year ago

It will match any number of number. more precisely it should be atleast one

Maheer Ali Over a year ago

@Code Maniac what you mean?

Code Maniac Over a year ago

+ stands for one or more. any can be zero also

jo_va · Accepted Answer · 2019-02-06 11:00:36Z

0

Use the \d token to match any digits combined with + to match one or more. Ending the regex with g, the global modifier, will make the regex look for all matches and not stop on the first match.

Here is a good online tool to work with regex.

const maskNumbers = str => str.replace(/\d+/g, 'X');

console.log(maskNumbers('abc123def4gh56'));

answered Feb 6, 2019 at 11:00

jo_va

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