(Regexps): Say up front that backslashes must be doubled in a Lisp program.

1 files changed, 3 insertions, 1 deletions

diff --git a/man/search.texi b/man/search.texi
index 9727075ebe1..56b5f37710f 100644
--- a/man/search.texi
+++ b/man/search.texi
@@ -385,7 +385,9 @@ character is a simple regular expression which matches that same
 character and nothing else.  The special characters are @samp{$},
 @samp{^}, @samp{.}, @samp{*}, @samp{+}, @samp{?}, @samp{[}, @samp{]} and
 @samp{\}.  Any other character appearing in a regular expression is
-ordinary, unless a @samp{\} precedes it.
+ordinary, unless a @samp{\} precedes it.  (When you use regular
+expressions in a Lisp program, each @samp{\} must be doubled, see the
+example near the end of this section.)
 
   For example, @samp{f} is not a special character, so it is ordinary, and
 therefore @samp{f} is a regular expression that matches the string