phpjs/functions/pcre/preg_grep.js

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function preg_grep(pattern, input, flags) {
  //  discuss at: http://phpjs.org/functions/preg_grep/
  // original by: Brett Zamir (http://brett-zamir.me)
  //        note: If pass pattern as string, must escape backslashes, even for single quotes
  //        note: The regular expression itself must be expressed JavaScript style
  //        note: It is not recommended to submit the pattern as a string, as we may implement
  //        note: parsing of PHP-style expressions (flags, etc.) in the future
  //   example 1: var arr = [1, 4, 4.5, 3, 'a', 4.4];
  //   example 1: preg_grep("/^(\\d+)?\\.\\d+$/", arr);
  //   returns 1: {2: 4.5, 5: 4.4}

  var p = '';
  var retObj = {};
  var invert = (flags === 1 || flags === 'PREG_GREP_INVERT'); // Todo: put flags as number and do bitwise checks (at least if other flags allowable); see pathinfo()

  if (typeof pattern === 'string') {
    pattern = eval(pattern);
  }

  if (invert) {
    for (p in input) {
      if ((input[p] + '')
        .search(pattern) === -1) {
        retObj[p] = input[p];
      }
    }
  } else {
    for (p in input) {
      if ((input[p] + '')
        .search(pattern) !== -1) {
        retObj[p] = input[p];
      }
    }
  }

  return retObj;
}