I don't know whether this has fixed meanwhile; it looks like a bug in
help2man 1.012 which has been used to create this man page (dated
Aug. 1999).
Werner
======================================================================
--- expr.1~ Tue May 9 01:16:17 2000
+++ expr.1 Sun Apr 15 22:42:31 2001
@@ -85,8 +85,8 @@
.PP
Beware that many operators need to be escaped or quoted for shells.
Comparisons are arithmetic if both ARGs are numbers, else lexicographical.
-Pattern matches return the string matched between \( and \) or null; if
-\( and \) are not used, they return the number of characters matched or 0.
+Pattern matches return the string matched between \\( and \\) or null; if
+\\( and \\) are not used, they return the number of characters matched or 0.
.SH "REPORTING BUGS"
Report bugs to <[EMAIL PROTECTED]>.
.SH "SEE ALSO"
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