This patch reproduce the same behavior of the regexp_* function with #147
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null input. Actually all NULL inputs in the regexp_* functions must returned NULL except for the modifier regexp flag. There is an exception with function regexp_replace(), if the pattern is null (second parameter) the original string is returned provided that there is no other null parameter except for the modifier. The patch fix also function oracle.regexp_substr() that was failing to return the right capture group when asked.
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null input.
Actually all NULL inputs in the regexp_* functions must returned NULL
except for the modifier regexp flag. There is an exception with function
regexp_replace(), if the pattern is null (second parameter) the original
string is returned provided that there is no other null parameter except
for the modifier.
The patch fix also function oracle.regexp_substr() that was failing to
return the right capture group when asked.