RegEx: Match numbers greater or equal than 1001

Question

I would like to match numbers greater than or equal to 1001(or '1001'). I tried the following pattern "^(^[1-9][0-9]{3,4}$)$" . It matches from 1000 and above.

Answer 1

(?!^1000$)^[1-9]\d{3,}$

Short Explanation

• (?!^1000$) Except the number 1000
• ^[1-9]\d{3,}$ Match 4 and more length numbers

JavaScript Example

 let regex = /(?!^1000$)^[1-9]\d{3,}$/; console.log(regex.test("1000")); console.log(regex.test("1001")); console.log(regex.test("10000")); console.log(regex.test("99995555"));

See the regex demo