问题
I'm working with orient-db database, and I've issues with regex pattern matching. I really need case-insensitive modifier to be present in the request, but somehow it doesn't work as I'm expecting.
Query:
select from UserAccounts where email MATCHES '^ther.*'
Returns as expected matches in lowercase.
Whenever I try to add a modifier, outside delimiters i.e.
select from UserAccounts where email MATCHES '\^ther.*\i'
I get an empty collection. Actually the query returns an empty collection whenever delimiters are present.
If there is no way to attach modifiers I could probably replace each 'alpha' char to an expression in square brackets i.e.
select from UserAccounts where email MATCHES "^[tT][hH][eE][rR].*"
But I'm not really happy with this solution.
回答1:
Using the Java case-insensitive regex modifier (from Pattern's special constructs) works in OrientDB 1.7.9 - for your example:
select from UserAccounts where email MATCHES '(?i)^ther.*'
(See also: Pattern - Special Constructs)
I've added a comment to the corresponding OrientDB issue as well.
回答2:
Unfortunately there is no way to specify modifiers for regex in matches operator.
For now the good solution would be to create a custom function, where you can use whole power of JS regexps.
But we definitely should add ability to specify modifiers in MATCHES, could you create a feature request?
来源：https://stackoverflow.com/questions/24164411/orient-db-regex-modifiers