what should be the RegExp for app version validation?

Question

I am stuck in one RegExp where I need to validate app version for app store and play-store. I have tried several RegExp but none of them is useful for me. Here are the example that pass the test

App version up-to 2-3 decimal point

1.0 // pass

1.0.0 // pass

1.0.0.0 // fail

a.0 // fail

1 // pass

I found one RegExp [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+ but this will only be valid when I have enter 4 decimal points. I don't know how to modify this.

Please help.

Answer 1

您已经提到了，up to 2-3 decimal那么RegExp必须是这个

^(\d+\.)?(\d+\.)?(\d+\.)?(\*|\d+)?$

Answer 2

您可以尝试以下正则表达式

let reg = /^[0-9]((\.)[0-9]){0,2}$/

console.log(reg.test('1.0')) //true
console.log(reg.test('1.1.0')) //true
console.log(reg.test('1')) //true

console.log(reg.test('1.')) //false
console.log(reg.test('1.a')) //false
console.log(reg.test('1.1.1.1')) //false