C regular match failure-CodePudding

Me grasp the content of the other sites to come over, want to use regular match out what I want, but how to how to write, regex_match returned are false

The scraping of the page code

 cstrings httpGet (cstrings url) {
USES_CONVERSION; 
CInternetSession s; 
CHttpFile * fileGet; 
Try {
FileGet=(CHttpFile *) s.O penURL (url); 
DWORD status; 
FileGet - & gt; QueryInfoStatusCode (status); 
//cout & lt; {} the catch (CInternetException * ex) 
FileGet=NULL; 
The ex - & gt; M_dwError; 
The ex - & gt; The Delete (); 
S.C lose (); 
Cout & lt; <"Abnormal" HTTP requests; 
Return L ""; 
} 
Cstrings strHtml=_T (" "); 
Char sRecived [1024]. 
While (fileGet - & gt; ReadString (LPTSTR sRecived, 1024).=NULL) {
StrHtml +=sRecived; 
} 
Return strHtml; 
Char * pChar=W2A (strHtml. GetBuffer ()); 
Cstrings gb2312String=ConvertUTF8toGB2312 (pChar, strlen (pChar)); 

FileGet - & gt; Close (); 
The delete fileGet; 
S.C lose (); 

Return gb2312String; 
}

The matching test

 cstrings response=httpGet (L "http://www.163.com/"); 
A string of text=cstr2str (response); 
Cout & lt; Const regex reg (" * ");//what doesn't work can regular 
Cout & lt; While (true); 
return 0;

Pray god to help

CodePudding user response:

You VS the regex is effective, VS low version of the regex may no implementation,

CodePudding user response:

refer to the original poster aspwebchh response:

me grasp the content of the other sites to come over, want to use regular match out of what I want, but how to how to write, regex_match returned are false

The scraping of the page code

 cstrings httpGet (cstrings url) {
USES_CONVERSION; 
CInternetSession s; 
CHttpFile * fileGet; 
Try {
FileGet=(CHttpFile *) s.O penURL (url); 
DWORD status; 
FileGet - & gt; QueryInfoStatusCode (status); 
//cout & lt; {} the catch (CInternetException * ex) 
FileGet=NULL; 
The ex - & gt; M_dwError; 
The ex - & gt; The Delete (); 
S.C lose (); 
Cout & lt; <"Abnormal" HTTP requests; 
Return L ""; 
} 
Cstrings strHtml=_T (" "); 
Char sRecived [1024]. 
While (fileGet - & gt; ReadString (LPTSTR sRecived, 1024).=NULL) {
StrHtml +=sRecived; 
} 
Return strHtml; 
Char * pChar=W2A (strHtml. GetBuffer ()); 
Cstrings gb2312String=ConvertUTF8toGB2312 (pChar, strlen (pChar)); 

FileGet - & gt; Close (); 
The delete fileGet; 
S.C lose (); 

Return gb2312String; 
}

The matching test

 cstrings response=httpGet (L "http://www.163.com/"); 
A string of text=cstr2str (response); 
Cout & lt; Const regex reg (" * ");//what doesn't work can regular 
Cout & lt; While (true); 
return 0;

Pray god help

Visual studio 2015

CodePudding user response:

reference 1st floor oyljerry response:

you VS the regex is effective, VS low version of the regex may no implementation,

The vs2015

CodePudding user response:

Regex_match request string matching the entire story from beginning to end, "*" can't match a newline, and there must be a newline characters in HTML text, so the match fails,
To search matching substring in the HTML, all you need is regex_search rather than regex_match

CodePudding user response:

It is recommended to use regtest software,

CodePudding user response:

Write their own filter function