Escape Regexps in search query by default

[flvrone]

Guys, don't you think it's better to have query string "regexp-escaped" by-default in your example initializer from README?

This is what you have there now:

  ## Match partial words on both sides (slower)
  config.regex = Proc.new { |query| /#{query}/ }

  ## Match partial words on the beginning or in the end (slightly faster)
  # config.regex = Proc.new { |query| /^#{query}/ }
  # config.regex = Proc.new { |query| /#{query}$/ }

And I could have just query like this: ...., and it will match anything that has at least 4 characters. Well this is quite simple example, but I believe it could lead to a lot of unwanted (and not obvious) results.

I believe it's better to replace what you currently have with this:

  ## Match partial words on both sides (slower)
  config.regex = Proc.new { |query| /#{::Regexp.escape(query)}/ }

  ## Match partial words on the beginning or in the end (slightly faster)
  # config.regex = Proc.new { |query| /^#{::Regexp.escape(query)}/ }
  # config.regex = Proc.new { |query| /#{::Regexp.escape(query)}$/ }

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UPDATE
It does not change anything actually, for some reason. Quite strange, it works in regular scopes though.

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UPDATE 2
OK, I see that you're actually already escaping keywords here:

mongoid_search/lib/mongoid_search/mongoid_search.rb

Line 61 in 304b371

escaped_kw = Regexp.escape(kw)

but it actually has no effect for me on mongoid 6.4.2. So I believe it's a bug.