Recent changes to Capture

WikiPage Capture modified by Bjorn Reese

Bjorn Reese — Sun, 05 Feb 2012 11:05:00 -0000

--- v4 
+++ v5 
@@ -4,7 +4,7 @@
 
 Regular expressions uses round brackets to group sub-expressions. For instance, a(bc)+ matches one "a" followed by one-or-more "bc" sequences. In addition to grouping sub-expressions, the round brackets are also used to capture (e.g. record for later use) the input that matches the sub-expression. If you wish to avoid the capturing, the you need to use the non-capturing variant a(?:bc)+.
 
-BNFA uses round brackets for non-capturing groups. This is how it works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g.
+BNFA uses round brackets for non-capturing groups. This is how round brackets works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g.
 rule r = text("a") >> capture(text("bc")+);
 
 ### Back-references ###

WikiPage Capture modified by Bjorn Reese

Bjorn Reese — Sun, 18 Sep 2011 09:02:18 -0000

--- v3 
+++ v4 
@@ -1,5 +1,7 @@
 ## Capture ##
 
+Please note: Capture is still under development.
+
 Regular expressions uses round brackets to group sub-expressions. For instance, a(bc)+ matches one "a" followed by one-or-more "bc" sequences. In addition to grouping sub-expressions, the round brackets are also used to capture (e.g. record for later use) the input that matches the sub-expression. If you wish to avoid the capturing, the you need to use the non-capturing variant a(?:bc)+.
 
 BNFA uses round brackets for non-capturing groups. This is how it works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g.

WikiPage Capture modified by Bjorn Reese

Bjorn Reese — Fri, 19 Aug 2011 17:09:12 -0000

--- v2 
+++ v3 
@@ -6,5 +6,3 @@
 rule r = text("a") >> capture(text("bc")+);
 
 ### Back-references ###
-
-BNFA does not support back-references as they pose an NP-complete problem. There are no plans for adding back-references.

WikiPage Capture modified by Bjorn Reese

Bjorn Reese — Thu, 18 Aug 2011 18:24:41 -0000

--- v1 
+++ v2 
@@ -2,7 +2,8 @@
 
 Regular expressions uses round brackets to group sub-expressions. For instance, a(bc)+ matches one "a" followed by one-or-more "bc" sequences. In addition to grouping sub-expressions, the round brackets are also used to capture (e.g. record for later use) the input that matches the sub-expression. If you wish to avoid the capturing, the you need to use the non-capturing variant a(?:bc)+.
 
-BNFA uses round brackets for non-capturing groups. This is how it works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g. text("a") >> capture(text("bc")+).
+BNFA uses round brackets for non-capturing groups. This is how it works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g.
+rule r = text("a") >> capture(text("bc")+);
 
 ### Back-references ###

WikiPage Capture modified by Bjorn Reese

Bjorn Reese — Thu, 18 Aug 2011 18:21:28 -0000

## Capture ## Regular expressions uses round brackets to group sub-expressions. For instance, a(bc)+ matches one "a" followed by one-or-more "bc" sequences. In addition to grouping sub-expressions, the round brackets are also used to capture (e.g. record for later use) the input that matches the sub-expression. If you wish to avoid the capturing, the you need to use the non-capturing variant a(?:bc)+. BNFA uses round brackets for non-capturing groups. This is how it works in C++. If you wish to capture a sub-expression, then you must specify it explicity with the capture() directive, e.g. text("a") >> capture(text("bc")+). ### Back-references ### BNFA does not support back-references as they pose an NP-complete problem. There are no plans for adding back-references.