REGEXP word boundary problem
I'm having a problem with REGEXP and word boundaries, my query does not throw an errow, but isn't giving me any results e.g. my query is: SELECT * FROM object WHERE description REGEXP '[[::]]elbow[[::]]'; There are records in the object table that have the following description fields (as test data): elbows ligaments elbowed ligaments My elbow elbow joint Whose elbow is that The query should, as far as I can tell from http://dev.mysql.com/doc/mysql/en/regexp.html, be returning the last three records, but is returning nothing... any ideas? Thanks Paul -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: REGEXP word boundary problem
Jigal van Hemert wrote: From: Paul Groves SELECT * FROM object WHERE description REGEXP '[[::]]elbow[[::]]'; There are records in the object table that have the following description fields (as test data): elbows ligaments elbowed ligaments My elbow elbow joint Whose elbow is that The query should, as far as I can tell from http://dev.mysql.com/doc/mysql/en/regexp.html, be returning the last three records, but is returning nothing... any ideas? Thanks First try: SELECT 'My elbow' REGEXP '[[::]]elbow[[::]]'; and SELECT 'elbowed ligaments' REGEXP '[[::]]elbow[[::]]'; to see whether the regular expression are working correctly. Yes, these both work fine... which makes me think there is something wrong with my syntax for my query, but I don't know what... I just ran a query similar to yours on a 4.0.23-standard server and it worked like a charm! I'm running 4.1.10a if it makes any difference regards Paul -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: REGEXP word boundary problem
Paul Groves wrote: Jigal van Hemert wrote: From: Paul Groves SELECT * FROM object WHERE description REGEXP '[[::]]elbow[[::]]'; There are records in the object table that have the following description fields (as test data): elbows ligaments elbowed ligaments My elbow elbow joint Whose elbow is that The query should, as far as I can tell from http://dev.mysql.com/doc/mysql/en/regexp.html, be returning the last three records, but is returning nothing... any ideas? Thanks First try: SELECT 'My elbow' REGEXP '[[::]]elbow[[::]]'; and SELECT 'elbowed ligaments' REGEXP '[[::]]elbow[[::]]'; to see whether the regular expression are working correctly. Yes, these both work fine... which makes me think there is something wrong with my syntax for my query, but I don't know what... Er... correction, it seems to work okay now, not sure what I was doing wrong before, sorry! BTW is there anyway to speed up the search, as I think this may be pretty slow (there will be about 25000 records in the real database...) e.g. maybe by doing a LIKE match for %elbow% first then doing a REGEXP within that? Not sure how one would code the SQL for that, though... regards Paul -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: REGEXP word boundary problem
Jigal van Hemert wrote: From: Paul Groves BTW is there anyway to speed up the search, as I think this may be pretty slow (there will be about 25000 records in the real database...) e.g. maybe by doing a LIKE match for %elbow% first then doing a REGEXP within that? Not sure how one would code the SQL for that, though... LIKE '%... ' will be pretty slow too, since it can't use an index, just like REGEXP can't. Take a look at http://dev.mysql.com/doc/mysql/en/fulltext-search.html , maybe this is what you need. Do read all the articles in section 12.6 to make sure you know the pros and cons... The main con for me is that it won't index words of three characters (which I think I will in my queries) or less unless I change the default server setting (can you do this on a by database basis?), which may be possible, but it depends where its finally hosted... regards Paul -- - 'It is attitudes not policies that are stifling innovation in educational uses of technology!' Do you agree? To discuss this, book now for **two major e-learning conferences** at Oxford University: 'Shock of the Old 5: Implementing Innovation' 7th April 2005 'Beyond the Red Tape' 8th April 2005 Details at: http://www.oucs.ox.ac.uk/ltg/events/ - -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
MySQL on Mac OS X?
Has anyone had any experience of running MySQL on Mac OS X? If so, how have you found it - is it stable and non-buggy? Also, has anyone had any experience of using both MySQL *and* PHP together on Mac OS X? I would be very interested to hear anyone's thoughts on this, regards Paul - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
MySQL on Mac OS X?
Has anyone had any experience of running MySQL on Mac OS X? If so, how have you found it - is it stable and non-buggy? Also, has anyone had any experience of using both MySQL *and* PHP together on Mac OS X? I would be very interested to hear anyone's thoughts on this, regards Paul -- Paul Groves, HCDT Senior Project Officer Humanities Computing Development Team OUCS, 13 Banbury Rd, Oxford, OX6 2NN. Tel: +44 (0)1865 273 290 Web: www.oucs.ox.ac.uk/hcdt/staff.html#paul HCDT is part of the Learning Technologies Group www.oucs.ox.ac.uk/ltg/ - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: just starting problem - WinNT
- Original Message - From: Neil Davies [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, August 31, 2001 12:11 PM Subject: just starting problem - WinNT I am using, well trying to use mysql through WinNT. I have successfully installed mysql and have had a look at the client programs provided with the package. I'm trying to use mysql through the DOS command prompt under Windows but when I type C:\mysql I get an error message saying that 'it's an unspecified file, program, etc.' Can someone direct me where I'm going wrong. Have you added c:\mysql\bin to your PATH? Paul MySQL is installed under C:\MySQL. I get the same result when I try it from an explicit directory too. - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] om Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
