Add new pgsql 15 functions

Signed-off-by: Matthew Peveler <matt@popsql.com>

src/basic-languages/pgsql/pgsql.ts

@@ -627,11 +627,15 @@ export const language = <languages.IMonarchLanguage>{
 		'range_intersect_agg',
 		'range_merge',
 		'rank',
+		'regexp_count',
+		'regexp_instr',
+		'regexp_like',
 		'regexp_match',
 		'regexp_matches',
 		'regexp_replace',
 		'regexp_split_to_array',
 		'regexp_split_to_table',
+		'regexp_substr',
 		'regr_avgx',
 		'regr_avgy',
 		'regr_count',