Sample in cloud.mongodb.com

{ title : { $regex: "краснаяАкула", $options: "i" }}

code-samples.space

Search v1 (AND)

?q_title_all_words=substr1,substr2

const getRegExpByWords = (arr) => {
  // NOTE: SEE also https://coderoad.ru/3041320/Regex-AND-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80
  // Replace regex reserved characters:
  const modifiedWords = arr.join(' ').replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')
  // Split your string at spaces & Encapsulate your words inside regex groups:
  const regexpGroups = modifiedWords.split(' ').map((w) => ['(?=.*' + w + ')'])
  // Create a regex pattern:
  const regexp = new RegExp('^' + regexpGroups.join('') + '.*$', 'im')

  return regexp
}

const regexp = getRegExpByWords(q_title_all_words.split(','))

options.title = { $regex: regexp }

Search v0 (OR)

?q_titles=substr1,substr2

options.title = {
  $regex: new RegExp(q_titles.split(',').join('|')),
  $options: 'i',
}

Substr

?q_title=substr

{"header" : { "$regex": q_title, "$options": "i" }}

https://stackoverflow.com/questions/32210122/mongoose-query-for-boolean-field

MongoDB Query for boolean field as “not true”