randexp | generate random data from a Regular Expression | Regex library

Currently doing maintenance for a project that was running React v15. Upgraded Webpack 3 > 4, Babel 6 > 7, css-loader 0.28.x > 3.0.0, etc.

Initially, updated React and used all the react-codemod + jscodeshift to transform the js files. While the version at that stage was not stable, it loaded and showed the proper styles etc.

What I find odd, is that after updating file-loader, css-loader, babel, and related packages, I kept getting Module not found: Error: Can't resolve, as following:

I'm trying to fix my PR in node restify npm package. Unfortunately travis job is failing for node 4 with the following error;

I have the following regex, wherein no digits must repeat:

I have a very simple javascript program which involves generating random strings of characters from a given set of allowed characters.

Generating random strings from a regular expression with randexp.js seems to be the most appropriate way to do so. However, since the set of allowed characters is a very simple one (basically all uppercase characters from the English alphabet and all digits) I wonder if loading an entire library isn't a bit overkill for such purpose. Instead I'm doing something like the following:

I need to generate a string based on regex which would result random letters and numbers, 4 dashes at random places in 36-character string.

Example:

123A5678-01B3C5F7-901R345-789F1-3456

I've figured out a regex that seems to validate given string well:

(?=.{36}$)([0-9A-Z]+-){4}([0-9A-Z])+

...but using the same for generating string in RandExp ends up in a mess. It generates 36-character string and adds 5 random-length groups:

new RandExp(/(?=.{36}$)([0-9A-Z]+-){4}([0-9A-Z])+/).gen()

M78QMOC6OGIF5OAJAJCG68CQWJGT5FX43CTKZ9CS9GXWLEKUKZMG602U5HPR4CEKO7OIX45CMLB7DS5RHZBI8KE8HGO9ET6OWS9A-PQSHN9E36KIMW328A1L0BHXCFOJVCD2ZT11-KD03XTZ375WP7CR7YSF4CTSX-0FBJ3MZ4RNDLA5UZOHI5QWVY66PTUDDRCG-OH4F688VM1

Should I just settle for fixed-width groups for my string using something like:

([0-9A-Z]{6}-){4}[0-9A-Z]{8}

... or is there any way I could improve the original regex?