diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/func.sgml | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 08f08322ca5..6c189bfed25 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -6166,6 +6166,9 @@ SELECT foo FROM regexp_split_to_table('the quick brown fox', '\s*') AS foo; The subexpression must entirely precede the back reference in the RE. Subexpressions are numbered in the order of their leading parentheses. Non-capturing parentheses do not define subexpressions. + The back reference considers only the string characters matched by the + referenced subexpression, not any constraints contained in it. For + example, <literal>(^\d)\1</literal> will match <literal>22</literal>. </para> <table id="posix-character-entry-escapes-table"> |