Use word boundary matching

[koenpunt]

@harvesthq/chosen-developers This fixes #75 (which has been around for 2 years already..), #1463 and actually also #1216, because the provided solution over there won't work.

By making use of word boundary matching (http://www.regular-expressions.info/wordboundaries.html) the split word search is much cleaner (no more actual splitting of strings), and the search results are better.

Example:
There is a Chosen select box with the option 'Heard Island and Mcdonald Islands' (like on the example page). With enable_split_word_search set to true (default) searching for 'and Mc' won't show any results. Although searching for 'and' and 'Mcdonald' does.

With my modifications the results will show as expected.

[pfiller]

Wow, this is great. I've been testing it and testing it and I think it works great. That being said, it's a pretty significant change to the way searches are performed in Chosen so I want to tread lightly.

I really want to make sure we've got this locked down before we totally +1 it. Obviously, @kenearly and @stof should weigh in (though I think the latter is on vacation).

• Copy this to a branch of Chosen and open a PR from there
• Add unit tests for verifying that search results are correct. To do this, we might need to break the actual search match function out of the winnow method.
• Performance Test with 1000s of items (perhaps replacing test + match with a single match call)
• Determine if we need to make an API change related to enable_split_word_search or search_contains. I don't think you should be able to turn off enable_split_word_search if search_contains is true, but I want to do some experimenting there.

This is really is pretty awesome. Thanks @koenpunt.

[pfiller]

Ok, #1483 is now the place for discussion and feedback. Any code changes for that branch should be done via a PR just as you would to master.

[crh3675]

I am rather unsure of how to patch my current (0.9.1) version of Chosen for this without having to compile Coffescript. Is there a Javascript patch that I could apply?