CODEWITHSUNDEEP
javascriptregex
Mark C.
Mark C.

Reputation: 6460

Only allow number in the thousands before decimal place and 4 decimal places

I'm trying to write a RegExp to allow this format : 5555.5555, and any other number should be parsed out/replaced with an empty string (or something).

I've tried a few different things, namely:

/((^[\d]{5,})|([\d]{1,4}\.?))/g - try to get everything that is not accepted and everything within 4 digits of an optional decimal so I can use the match in the .replace method.

The ultimate goal is to take an input of 55555555.5555555 and spit back out 5555.5555. I'm struggling with the fact that it matches a 5. but doesn't give back the entire 5555..

Upvotes: 0

Views: 31

Answers (1)

Kamil Kiełczewski
Kamil Kiełczewski

Reputation: 92527

Try

let str= "55555555.5555555";
let r= str.match(/\d{4}\.\d{4}/);

console.log(r[0]);

Upvotes: 1

Related Questions