Name
ORA-12731: invalid collation class in regular expression
Synopsis
You specified a collation element that does not exist in your current
sort order. For example, specifying [.ch.] when
NLS_SORT is other than XSPANISH or XCZECH will cause this error,
because other languages never treat the combination
'ch' as a single character. Check your expression
to be sure that each use of [= and
=] is valid, and check your NLS_SORT setting.
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