Question

I’m working with C# .Net and ms-access database.

I have the following SQL query:

  `Select ... Like "%<aaa>%"+prmPhrase+"%</aaa>%"` 

The query is looking for a phrase inside a database field which contains xml data.

the query works very quickly, but it returns a lot of false results. I can’t search only the exact phrase because i have a list of word boundry markers:

  ' ', '-', '.', ':', ',', ';', '/'

for example:

  prmPhrase = run  
  "i run home" -ok  
  "i.run-home" - ok  
  "running" - false result - not ok  

It takes me a lot of time to extract the ok results by code, and return only the ok sentences.

I would like to know if there is anything like regex or something which i could do a better query to return only the ok results without the false ones.

maybe this could help:

Search for "whole word match" in MySQL

Thanks For Advance!

Answer 1

Your task could be solved with something like “%” + SetA + “run” + SetB + “%”
where setA all symbols allowed before phrase (e.g. [a-z]*, to prevent end of tag, so % does not work), setB – all allowed delimiters (e.g. [^a-z0-9]).
I am afraid you could not define SetA with %, _, []
So you should simplify your task.