WbICHA

/(?<=[a-z])[a-z]+(?=[a-z])/

/[a-z]([a-z]+)[a-z]/

if(
	/[a-z]/.test(str)
  && /[A-Z]/.test(str)
  && /\d/.test(str)
  && /^[a-zA-Z\d]{6,}$/.test(str)
)

"/srv/resources/ds_demo12/image_%l.jpg".match(/%./)[0];

url.replace(/.*(%.).*/, (str, substr) => **********)

(() => {
  const fields = [
    {
      name: 'Car',
      options: {
        min: 'Audi',
        max: 'Big Toyota',
      }
    },
    {
      name: 'name',
      options: {
        min: 'Иван',
        max: 'Алексей Иванович',
      }
    }
  ];
  const origStr = 'Привет, меня зовут {{name}}! У меня есть машина {{car}}';
  
  const replaceKeysToText = (str, optionsKey) =>
    str.replace(/\{\{\s*(\w+)\s*\}\}/g, (fullMatch, key) => {
      const field = fields.find((f) => f.name.toLowerCase() === key);
      if(!field) {
        return fullMatch;
      }
      return field.options[optionsKey];
    });
  
  const short = replaceKeysToText(origStr, 'min');
  const long = replaceKeysToText(origStr, 'max');
  
  return [short, long];
})()