Is it possible to pass flags in to regex_matches with PostgreSQL? - postgresql

Question

I'm trying to select multiple matches from a field, I have the query working as SQL but am at a loss when it comes to the jOOQ version. Here's the SQL:
SELECT
array_to_string(array(select array_to_string(regexp_matches(m.content, '#([a-zA-Z0-9]+)', 'g'), ' ')), ' ') hashtags
FROM tweets
But I can't work out how to pass in the 'g' flag to regexp_matches, and Postgres doesn't support g: style embedded flags. At the moment I'm using (in Scala):
val hashtags = DSL.field(
"array_to_string(array(select array_to_string(regexp_matches(tweets.content, '#([a-zA-Z0-9]+)', 'g'), ' ')), ' ')",
classOf[String])
but that seems kind of gross (but it works, so there's that! 😀).
Current Approach
I have an enum with fields associated with it, like this:
MentionUri(MENTIONS.URL),
Content(MENTIONS.CONTENT),
Hashtags(DSL.field(
"array(select array_to_string(regexp_matches(mentions.content, '#([a-zA-Z0-9]+)', 'g'), ' '))").as("hashtags")),
MediaLinks(DSL.field("json_agg(twitter_media)").as("media_links")),
Location(MENTIONS.LOCATION),
the 'g' flag is needed because I want to get all of the matching fragments from the target text (all of the hashtags from the mention content in this case, where mentions are Tweets, Facebook posts, &c.)
and a class with a bunch of optional search parameters, like this:
minFollowing: Option[Int] = None,
maxFollowing: Option[Int] = None,
workflowStates: Set[WorkflowState] = WorkflowState.values.toSet,
onlyVerifiedUsers: Boolean = false,
and then I build up the query based on a list of these fields
private val fields = v.fields.toSet
override def query(sql: DSLContext): Query = {
val fields = v.fields.map(_.field) ++ Seq(M.PROJECT_ID)
var query = (sql
select fields.toSet.asJava
from M
leftJoin MTM on (M.PROJECT_ID === MTM.PROJECT_ID) and (M.ID === MTM.MENTION_ID)
leftJoin TM on (MTM.URL === TM.URL)
where (M.PROJECT_ID in v.criteria.projectIds.asJava))
if (v.criteria.channels.size < numChannels)
query = query and (M.CHANNEL in v.criteria.channels.asJava)
if (v.criteria.mentionTypes.size < numMentionTypes)
query = query and (M.MENTION_TYPE in v.criteria.mentionTypes.asJava)
// ... more critera get added here, finally ...
if (v.max.isDefined)
query groupBy (M.PROJECT_ID, M.ID, M.CHANNEL, M.USERNAME) limit v.max.get
else
query groupBy (M.PROJECT_ID, M.ID, M.CHANNEL, M.USERNAME)