[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3404) Regular expressions (regex) boolean operator in HQL's where clause: rlike in mysql, regexp_match in informix, ... (regression from hibernate2)

[Ancoron Luziferis (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32910#action_32910 ] 

Ancoron Luziferis commented on HHH-3404:
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For PostgreSQL there are two ways:

# The {{[NOT] SIMILAR TO}} operator (including support for the escape character sequence):
#* {{'abc' SIMILAR TO 'abc'}}
#* {{'abc' SIMILAR TO 'a'}}
#* {{'abc' SIMILAR TO '%(b|d)%'}}
#* {{'abc' SIMILAR TO '(b|c)%'}}

The POSIX regular expression operators:
||Operator||Description||Example||
|~|Matches regular expression, case sensitive|'thomas' ~ '.*thomas.*'|
|~*|Matches regular expression, case insensitive|'thomas' ~* '.*Thomas.*'|
|!~|Does not match regular expression, case sensitive|'thomas' !~ '.*Thomas.*'|
|!~*|Does not match regular expression, case insensitive|'thomas' !~* '.*vadim.*'|



> Regular expressions (regex) boolean operator in HQL's where clause: rlike in mysql, regexp_match in informix, ... (regression from hibernate2)
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-3404
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3404
>             Project: Hibernate Core
>          Issue Type: New Feature
>          Components: query-hql
>    Affects Versions: 3.2.6
>            Reporter: Geoffrey De Smet
>
> Hibernate 2 supported the rlike boolean operator (at least for mysql): HB-1034. Hibernate3 currently doesn't.
> It turns out that most mainstream databases support regular expression patterns (independently from normal like patterns).
> Mysql: rlike
>   where a.serial rlike '\d*'
> Informix: regexp_match()
>   where regexp_match(a.serial, '\d*')
> Oracle: REGEXP_LIKE
>   where REGEXP_LIKE(a.serial, '\d*')
> There have been several forum posts asking about this feature for hibernate3 btw:
> http://forum.hibernate.org/viewtopic.php?p=2391395
> http://forum.hibernate.org/viewtopic.php?p=2375634
> etc

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