Revision: 557
http://vcs.pcre.org/viewvc?view=rev&revision=557
Author: ph10
Date: 2010-10-26 16:26:12 +0100 (Tue, 26 Oct 2010)
Log Message:
-----------
Add more explanation about conditional subpatterns.
Modified Paths:
--------------
code/trunk/doc/pcrepattern.3
Modified: code/trunk/doc/pcrepattern.3
===================================================================
--- code/trunk/doc/pcrepattern.3 2010-10-26 11:06:44 UTC (rev 556)
+++ code/trunk/doc/pcrepattern.3 2010-10-26 15:26:12 UTC (rev 557)
@@ -1966,7 +1966,14 @@
.sp
If the condition is satisfied, the yes-pattern is used; otherwise the
no-pattern (if present) is used. If there are more than two alternatives in the
-subpattern, a compile-time error occurs.
+subpattern, a compile-time error occurs. Each of the two alternatives may
+itself contain nested subpatterns of any form, including conditional
+subpatterns; the restriction to two alternatives applies only at the level of
+the condition. This pattern fragment is an example where the alternatives are
+complex:
+.sp
+ (?(1) (A|B|C) | (D | (?(2)E|F) | E) )
+.sp
.P
There are four kinds of condition: references to subpatterns, references to
recursion, a pseudo-condition called DEFINE, and assertions.
