get-command-args.ts

import { deunionize } from 'telegraf';

import { Context } from '../interfaces';

export const getCommandArgs = (ctx: Context): string | null => {
  const messageText = deunionize(ctx.message).text;

  const argsFromCommandRegex = /\/(?:\w+)(?:@\w+?_bot)? (?<args>.*)/i;
  const args = argsFromCommandRegex.exec(messageText);

  if (!args) {
    return null;
  }

  return args.groups.args.trim();
};