Reg Extend: to extend native JS RegExp.

regext.js

const regexExtract = new RegExp('\/(.*)\/([gimuy]+)?');

class RegExt extends RegExp {
  constructor(input) {
    if (typeof input === 'string' || input instanceof String) {
      if (regexExtract.test(input)) {
        let parts = regexExtract.exec(input);
        super(parts[1], parts[2] || '');
      } else {
        super(input);
      }
    } else if (input instanceof RegExp) {
      super(input);
    }
  }

  toJSON() {
    return this.toString();
  }
}

exports = module.exports = RegExt;

To extend native JS RegExp on:

• Fixing JSON.stringify(regEx) which only retruns "{}"
• Able to get a reg string. For exmaple, new RegExt('/abc/gi') // => /abc/gi

Examples

a  = new RegExt("abc") // => /abc/
b  = new RegExt("/abc/gi") // => /abc/gi

JSON.stringify(b) // => "/abc/gi";