ORA-12729: invalid character class in regular expression

For using regular expression, we can use following format:

Here is the complete list of valid character classes:

[:alnum:] All alphanumeric characters
[:alpha:] All alphabetic characters
[:blank:] All blank space characters.
[:cntrl:] All control characters (nonprinting)
[:digit:] All numeric digits
[:graph:] All [:punct:], [:upper:], [:lower:], and [:digit:] characters.
[:lower:] All lowercase alphabetic characters
[:print:] All printable characters
[:punct:] All punctuation characters
[:space:] All space characters (nonprinting)
[:upper:] All uppercase alphabetic characters
[:xdigit:] All valid hexadecimal characters