How can I identify a pattern in JavaScript that may include a certain character but cannot end with it using regex?

I am a beginner in the world of regular expressions. Despite my efforts to find a solution for my specific case, I have not been successful. I have tested several ideas that I came across, but none of them have worked for me.

I have a unique repetitive pattern that I have attempted to match. While I have made progress, I have not yet found the exact solution. Here is the RegEx I have used:

/((([a-zA-IK-Z][a]?)[\d]{1,3}[a-zA-Z]?)(-)?){1,}/g

My pattern examples:

Aa200-B300-M52A-G5-Aa50   (matches as expected)
Aa200-B300-M52A-G5-A      (does not match as expected)
Aa200-B300-M52A-G5-Aa     (does not match as expected)

While this pattern works well for most cases, I want it to exclude scenarios like the following example:

Aa200-B300-M52A-     (ending with -)

What is the best approach to achieve this desired outcome?

javascriptregex

Answer №1

Feel free to utilize this regular expression pattern:

/^[a-zA-IK-Z]a?\d{1,3}[a-zA-Z]?(?:-[a-zA-IK-Z]a?\d{1,3}[a-zA-Z]?)*$/gm

Check out the RegEx Demo here

Ensuring that - only appears in the middle and not at the end is achieved by positioning it at the beginning of the repeating non-capturing group.

Answer №2

Give this a shot - it's set up so that if there is a next group, there should be a "-" before it. I also adjusted your number groups from {1,3} to {0,3} because the expected matches may not always contain a number (2nd and 3rd cases). Let me know how it goes!

const regex = /^([a-zA-IK-Z]a?[\d]{0,3}[a-zA-Z]?)(-([a-zA-IK-Z]a?[\d]{0,3}[a-zA-Z]?))*$/;

console.log("Should match");
console.log("Aa200-B300-M52A-G5-Aa50".match(regex));
console.log("Aa200-B300-M52A-G5-A".match(regex));
console.log("Aa200-B300-M52A-G5-Aa".match(regex));

console.log("Should not match");
console.log("Aa200-B300-M52A-G5-".match(regex));

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