I'm limiting the user to input a string contains four letters following with 4 digit of numbers, like the format qwer1234 in vue.js. I have tried the regex b[a-z]{4} [0-9]{4}\b but it seems not working. Are there any mistake I make?

CodePudding user response：

I deleted the ' ', and it works!

var pattern = /\b[a-z]{4}[0-9]{4}\b/;
var str = "";
console.log(pattern.test(str));

CodePudding user response：

4 lowercase characters would be:

• [a-z]{4}

4 digits would be

• \d{4}

a word boundary is

• \b

the start or end of a line are marked like this:

• ^...$

So, if this phrase should be contained (possibly only as a part) of a bigger phrase, put word boundaries around it.

• \b[a-z]{4}\d{4}\b

or if the entire phrase has to match exactly, then you can put it between start and end characters.

• ^[a-z]{4}\d{4}$