"You must include at least one positive keyword with 3 characters or more."

What keyword(s) did you enter in the search box?

And do you have any search preprocessing modules installed, like fuzzy search or a stemming module?

Are you getting this when you first go to (your site url)/search and enter the keywords there, or just when you enter them in the search box that is in your header/sidebar/etc.?

Well, I don't know what to tell you.

I just tried this on a clean Drupal 6.x install, and I am not seeing this problem. When I enter a search term, I get no results (because I have no content), but I am definitely not seeing the "you must include at least one positive keyword..." message unless I don't enter a long-enough keyword. E.g. I enter "up" and I get the message, I enter nothing and I get a "please enter some keywords" message, and I enter "hello" and I just get no search results.

So all I can suggest trying is:
a) Download Drupal again and copy in all the files again, to make sure Drupal core is not corrupted.
b) Disable all non-Core modules.
c) Switch to an unmodified Garland theme, or any of the other themes that come with Drupal core.
d) After you do both of the above, go to the Performance page, and click the "clear all caches" button.

After doing this, if your problem still persists, then I have no other ideas...

I can confirm I don't have the issue on a clean Drupal 6 installation.

I had the same problem, and I just find out that was the "opensearch feed" module causing that problem.
I just disabled it (while keeping opensearch plugin enabled) and the search returned to work fine.

Are you using that module? (maybe, try to disable all the search-related modules one-by-one and see what happens..)

I am using:
Drupal core : 6.19
OpenSearch module : 6.x-1.2
The site on which I had problems is multilanguage-enabled too.

i'm getting the same message regardless what word do I put in the search box.

I must have done something to cause this ... but I have no idea what :)

Any expert help would be highly appreciated.

site: http://www.hellaswebnews.com/frontpage

best regards, hellaswebnews

@ -redShadow-

i see you fix the search problem.

can you share how (i do have the same issue you had)

cheers,

@ hellaswebnews

I just disabled a search-related module (part of http://drupal.org/project/opensearch) that was giving me that problem.
I suggest trying disabling that (if you are using it) or any other search-related modules, and if the problem is gone away, try to re-enable them back one-by-one to try to figure out which one(s) caused the issue.

Sounds like this support issue has been resolved?

Sorry... we cannot reproduce your problem, so we can't really debug it. Drupal by itself doesn't have this problem -- it has to be some other module (or even a theme) that is doing something related to searching.

Hello,

I think i've solved this, just commenting ,in my case, two lines (u can find them just doing a grep)
Maybe u have only one to change.

grep -R "You must include at least" *

sites/all/modules/views/modules/search/views_handler_filter_search.inc:        //form_set_error($key, t('You must include at least one positive keyword with @count characters or more.', array('@count' => variable_get('minimum_word_size', 3))));

modules/search/search.module:    //form_set_error('keys', t('You must include at least one positive keyword with @count characters or more.', array('@count' => variable_get('minimum_word_size', 3))));

I had the same problem come up which I tracked down to a recent PCRE update. This would affect Drupal 7.12 and below. See #1446372: Invalid Unicode code range in PREG_CLASS_UNICODE_WORD_BOUNDARY fails with PCRE 8.30 for patches.

I have the same annoying problem. My production site and beta testing site are both multilingual. I have reloaded both sites and still it is not working. I also do not have access to the server to run patches.

http://drupal.org/node/1777774#comment-6540016