liniarc / regexprogram Goto Github PK

aaa'aaa

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I couldn't get past Problem 6 which requries the use of back reference \#, I think the code needs to be enbabled for back references (from 1.52 doc, the version I am using):

no_bk_refs: When set then backreferences are disabled. This bit is on by default for POSIX-Extended regular expressions, but can be unset to support for backreferences on.

I made the following change:

diff --git a/regex.cpp b/regex.cpp
index fd39b1b..8847690 100644
--- a/regex.cpp
+++ b/regex.cpp
@@ -289,7 +289,7 @@ void performRegex()
     {
         if (extended)
         {
-            r.assign(regexPattern.c_str(), regex::extended);
+            r.assign(regexPattern.c_str(), regex::extended & ~regex::no_bk_refs);
         }
         else
         {

It does work for me. I could confirm that with the first problem (a)b\1 to see it matching "aba". I am not familiar with Boost or C++, not sure if this is the right fix, or I'd just submit a PR.

(Can we get an option for jumping to problem # or a key to skip a problem?)

regex.com.cn is for sale in aliyun.com,the price is 8888

regex.com.cn is for sale in aliyun.com ,the price is 8888

regex.cpp:7:27: fatal error: boost/regex.hpp: No such file or directory
#include <boost/regex.hpp>

System is xubuntu-14.04

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ad06f27c-b7d9-4d26-bdf9-44b263a43902

these were my steps to get it running:

1. brew install boost
2. remove "-ltinfo" from makefile
3. make
4. ./regex

(btw -ltinfo not found was after installing boost and i already had ncurses)

Is there anybody who can tell me how to pass problem10? I tried to use
foo\((.*?), (.*?)\)
and replaced with
bar\(\2, \1\)
It worked well on my local PC, but cannot pass the problem.

If I use .*? pattern, I cannot catch any part of string, what should I use to pass the problem?

a

Blue highlights, thus far unexplained?

I think game is not enough the list of answers. For example:
I try to complete level 6. And have some problem. I understand the answer is ^(.)(.*)($1)$ (or $1 replace to \1), but I can't complete this level. And I want to correct learn regexp at previous levels. I think the game needed answers list, and list of beautiful solution