postgresql provides powerful regular expression system that can achieve fuzzy query at the database level.
Match Regular Expression Operators:
| Operators | description | example |
|---|---|---|
| ~ | Match the regular expression, case sensitive | 'Thomas' ~ '. * Thomas *.' |
| ~* | Match the regular expression, case insensitive | 'Thomas' ~ *. * Thomas. *' |
| !~ | Does not match regular expression, case sensitive | 'Thomas'! ~ '. * Thomas. *' |
| !~* | Does not match regular expression, case insensitive | 'thomas' !~* '.*vadim.*' |
For example:
to find the data sheet account all user names containing information about the user baidu not case-sensitive.
select * from account where username ~ * 'baidu';
the use of regular expressions may be implemented after the case-insensitive function, and greatly reduces the length of the sql statement.