Find a string that contains 1 to 4 uppercase letters and 0 to 3 digits (visual studio code, javascri-CodePudding

This question was

I would like to know if there is a better option than

^(202\d)(\d{0,3}[A-Z]{1,4}|[A-Z]{1,4}\d{1,3})([\dA-Z]{0,4})A

for (xxxx) should contain at least 1 uppercase and no more than 3 digits?

Test with my demo

CodePudding user response：

Your final regex will also match the below two lines, because it allows up to 3 4 4 characters for that second part, and also just 1 letter:

2022999BBBB9999A
2022BA

For the part that must have 4 alphanumericals, including at least one letter, you could express that condition as follows:

Like this: