How can I make this RegEx into JavaScript RegExp object?

Question

I have this RegEx which allows people to input max 7 digits before decimal and two after which is optional.

I figure it would be neater to put them into a variable. I have searched through with people saying use the RegExp object but I am still confused how it's done.

This is what I have with my RegEx.

/^(\d{1,7})(\.\d{2})?$/

You may consider using <input type="text" pattern="\d{1,7}(\.\d{2})?" /> — Tushar
– Tushar, Commented Dec 21, 2016 at 11:50

Community · Accepted Answer · 2017-05-23 12:24:52Z

2

You can use the following code:

var max1 = 7;
var max2 = 2;
var rx = new RegExp("^(\\d{1," + max1 + "})(\\.\\d{" + max2 + "})?$");
console.log(rx.test("1234567.12"));
console.log(rx.test("1234567.123"));
console.log(rx.test("12345678.12"));

Also, check these posts:

edited May 23, 2017 at 12:24

CommunityBot

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answered Dec 21, 2016 at 11:40

Wiktor Stribiżew

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1 Comment

Dora Over a year ago

this is nice...never thought of extracting the max numbers out into variables. learned something new again... thx thx

Sahadev · Accepted Answer · 2016-12-21 11:43:32Z

0

you can use:

var patt = new RegExp(/^(\d{1,7})(\.\d{2})?$/);

How to test:

console.log(patt.test('1234567ab')) : false

console.log(patt.test('1234567.12')) : true

answered Dec 21, 2016 at 11:43

Sahadev

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1 Comment

Sahadev Over a year ago

Ok i got your point just pass limits into variable and append with pattern into RegExp

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