-11. If (*THEN) is present in a group that is called as a subroutine, its action -is limited to that group, even if the group does not contain any | characters. +11. If any of the backtracking control verbs are used in an assertion or in a +subpattern that is called as a subroutine (whether or not recursively), their +effect is confined to that subpattern; it does not extend to the surrounding +pattern. This is not always the case in Perl. In particular, if (*THEN) is +present in a group that is called as a subroutine, its action is limited to +that group, even if the group does not contain any | characters. There is one +exception to this: the name from a *(MARK), (*PRUNE), or (*THEN) that is +encountered in a successful positive assertion is passed back when a +match succeeds (compare capturing parentheses in assertions). Note that such +subpatterns are processed as anchored at the point where they are tested.
12. There are some differences that are concerned with the settings of captured @@ -129,7 +137,7 @@ an error is given at compile time.
14. Perl recognizes comments in some places that PCRE does not, for example, between the ( and ? at the start of a subpattern. If the /x modifier is set, -Perl allows whitespace between ( and ? but PCRE never does, even if the +Perl allows white space between ( and ? but PCRE never does, even if the PCRE_EXTENDED option is set.
@@ -203,7 +211,7 @@ Cambridge CB2 3QH, England.
REVISION
-Last updated: 08 Januray 2012
+Last updated: 01 June 2012
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