需要正则表达式专业知识

Question

I need help figuring out a regular expression for the rule:

6 characters, starting with letter R (uppercase), and followed by digits where at least one digit is not 0.

My attempt so far is "[R][0-9]{5}[1-9]+" but I keep getting a false when it should be returning true for R01001. I'm stumped, Any help would be appreciated.

Answer 1

You can use:

^R(?=0*[1-9])[0-9]{5}$

Working Demo: http://regex101.com/r/bA7yI9

Explanation: