The regexp pattern characters ^ and $ should be explained as matching

at the beginning and end of the input string, not the beginning and end
of "a line", since Postgres does not allow them to match at newline
characters in the data.

doc/src/sgml/func.sgml

@@ -1,4 +1,4 @@
-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.55 2001/03/15 01:07:51 tgl Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.56 2001/03/25 18:14:31 tgl Exp $ -->
 
 <chapter id="functions">
  <title>Functions and Operators</title>
@@ -1205,9 +1205,9 @@
     expression), an empty set of <literal>()</literal> (matching the
     null string), a <firstterm>bracket expression</firstterm> (see
     below), <literal>.</literal> (matching any single character),
-    <literal>^</literal> (matching the null string at the beginning of
-    a line), <literal>$</literal> (matching the null string at the end
-    of a line), a <literal>\</literal> followed by one of the
+    <literal>^</literal> (matching the null string at the beginning of the
+    input string), <literal>$</literal> (matching the null string at the end
+    of the input string), a <literal>\</literal> followed by one of the
     characters <literal>^.[$()|*+?{\</literal> (matching that
     character taken as an ordinary character), a <literal>\</literal>
     followed by any other character (matching that character taken as