Perl-influenced Extensions in Oracle Regular Expressions

Oracle Database regular expression functions and conditions accept a number of Perl-influenced operators that are in common use, although not part of the POSIX standard. Table D-3 lists those operators. For more complete descriptions with examples, refer to Oracle Database Development Guide.

Table 3 Perl-influenced Operators in Oracle Regular Expressions

Operator	Description
\d	A digit character.
\D	A nondigit character.
\w	A word character.
\W	A nonword character.
\s	A whitespace character.
\S	A non-whitespace character.
\A	Matches only at the beginning of a string, or before a newline character at the end of a string.
\Z	Matches only at the end of a string.
*?	Matches the preceding pattern element 0 or more times (nongreedy).
+?	Matches the preceding pattern element 1 or more times (nongreedy).
??	Matches the preceding pattern element 0 or 1 time (nongreedy).
{n}?	Matches the preceding pattern element exactly n times (nongreedy).
{n,}?	Matches the preceding pattern element at least n times (nongreedy).
{n,m}?	Matches the preceding pattern element at least n but not more than m times (nongreedy).