Generate Random Strings Matching Predefined Pattern or Format for Enhanced Flexibility and Control

[wuletawwonte]

Right now, it is not possible to get a random string based on a pattern or format provided. For example, provide "A0" as a pattern where A represents an uppercase letter and 0 represents a digit, and get something like "H7"

It would be nice if the package provides a method like generateWithPattern(pattern) that takes a pattern as an input and generates a random string based on that pattern. One possible approach could be adding pattern as an argument in the options object. What do you think about this feature?

[Dagic-zewdu]

What is your suggestion in implementation.

[wuletawwonte]

We may need to refactor it but we can do something like this

const characterSets: { [key: string]: string } = {
  a: 'abcdefghijklmnopqrstuvwxyz',
  A: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
  '0': '0123456789',
  '!': '~`!@#$%^&*()_+-={}[]:";\'<>?,./|\\',
};

const generateWithPattern = (pattern: string) => {
  let result = '';
  const patternLength = pattern.length;
  for (let i = 0; i < patternLength; i += 1) {
    const charSet = characterSets[pattern.charAt(i)];
    if(charSet) {
      const randomBytes = crypto.randomBytes(1);
      const randomIndex = Math.floor((randomBytes[0] / 256) * patternLength);
      result += charSet.charAt(randomIndex);
    } else {
      result += pattern.charAt(i);
    }
  }
  return result;
};

For a pattern like Aa0!hN this would generate a string similar to Uw7*hN. To integrate to the package we can get the charset from the types.ts file and even use the compute method to avoid code duplication.