Make character in front mandatory / required

Question

I need to match the following pattern: NNN

324324.234324.234324 matches, as well as 1.1.1

I have the following pattern:

(\d*\.\d*\.\d*)

Problem is, it matches NN already at the second dot, so, how can I make the following number mandatory ?

Answer 1

Use ^ and $ anchors and also change * to + since at least one number is required

also, (\\d*\\.){2} can be used to simplify \\d+\\.\\d+\\.

 [ '324324.234324.234324', '324324.234324.' ].forEach(test => console.log(/^(\\d+\\.){2}\\d+$/.test(test)) ); 

Answer 2

更改为一个或多个非贪婪+?

(\\d+?\\.\\d+?\\.\\d+)