C #: Obtain the regular expression matching the code on the webpage (obtain the value between the start and end strings in the string)

For example:
<Div> 1Div </div>
<A> 1A </a>
<P> 1 P </P>
<P> 2 P </P>
<Div> 2div </div>
<A> 2a </a>
<P> 3 P </P>
<P> 4 P </P>
<A> 3A </a>
<P> 5 p </P>
<Div> 3div </div>
<A> 4A </a>
<P> 6 P </P>
<Span> 1 span </span>

The problem is: there are n multiple Div, N multiple p, N multiple A tags and a maximum of 1 span, to obtain only the content in all P and the content in the last span (where the content obtained from P has a condition, that is, only the content of P with the previous a tag will be obtained.) span may not exist. If yes, it will be obtained. If no, it will not be obtained:

C # Regular Expression Using System. Text. regularexpressions;

 

 

Code

  String Restult =   "" ;
Foreach (Match m In RegEx. Matches (STR, @" (? INS )(? <= (</A> \ s * <(? <Mark> P [^>] *>) | <(? <Mark> span) [^>] *>) [\ s] +? (? = </\ K <mark>) " ))
{
Restult + = M. value; // Is the result you want

MessageBox. Show (M. value );
}

 

Or use Foreach (Match m In RegEx. Matches (yourhtml, @" (? Is) (</a> \ s * <(? <Mark> P [^>] *>) | <(? <Mark> span) [^>] *> )(? <DATA> [\ s] + ?) </\ K <mark> " ))
{
M. Groups [ " Data " ]. Value; //
}

 

Or >>>>>>Obtains the value between the start and end strings.

Code

# Region Obtains the value between the start and end strings.
///   <Summary>
/// Obtains the value between the start and end strings.
///   </Summary>
///   <Param name = "begin"> Start matching mark </Param>
///   <Param name = "end"> End match tag </Param>
///   <Param name = "html"> HTML string </Param>
///   <Returns> Returns an intermediate string. </Returns>
Public   Static Matchcollection getmidvalue ( String Begin, String End, String Html)
{
RegEx Reg =   New RegEx ( " (? <= ( "   + Begin +   " ) [. \ S] *? (? = ( "   + End +   " )) " , Regexoptions. multiline | Regexoptions. singleline );
Return Reg. Matches (HTML );
}
# Endregion

 

 

Code

  ///   <Summary>  
/// Obtains the value between the start and end strings.
///   </Summary>  
///   <Param name = "str"> </param>  
///   <Param name = "S"> Start </Param>  
///   <Param name = "E"> End </Param>  
///   <Returns> </returns>  
Private   String Getvalue ( String STR, String Start, String End)
{
RegEx RG =   New RegEx ( " (? <= ( "   + Start +   " ) [. \ S] *? (? = ( "   + End +   " )) " , Regexoptions. multiline | Regexoptions. singleline );

Return RG. Match (STR). value;
}

 

 

 

// Regular expression is used to extract a single table, which can be good according to a specific Identifier character in the table!

If only"Member Information"This is used as a reference mark, and I can use the above slightly modified, the problem is that, if" 00 "or" 444 "is used as a reference mark, considering the nesting of <Table> labels, we must ensure that the inmost <Table> containing the reference identity is obtained, and that the <Table> and </table> matching must be ensured.

 

Code

Match mm = RegEx. Match (HTML, @" <Table [^>] *> (<Table [^>] *> (? <O>) | </table> (? <-O>) | (?! </? Table) [\ s]) *) (? (O )(?!))) \ B "   +   " Member Information "   +   @" \ B (? :(?! <Table [^>] *>) [\ s]) *? (<Table [^>] *> (? <O>) | </table> (? <-O>) | (?! </? Table) [\ s]) *) (? (O )(?!))) </Table> " , Regexoptions. ignorecase );

 

If a regular expression has special characters in the input reference identity, it must be preprocessed.Program.
If multiple input reference IDs appear in the source string, the <Table>

// Extract the content in TB from a single table using regular expressions .........

Code

Match mm = RegEx. Match (HTML, @" <Table [^>] *> (<Table [^>] *> (? <O>) | </table> (? <-O>) | (?! </? Table) [\ s]) *) (? (O )(?!))) \ B "   +   " Member winning/losing Materials "   +   @" \ B (? :(?! <Table [^>] *>) [\ s]) *? (<Table [^>] *> (? <O>) | </table> (? <-O>) | (?! </? Table) [\ s]) *) (? (O )(?!))) </Table> " , Regexoptions. ignorecase );
If (Mm. Success)
{
// MessageBox. Show (Mm. value );

// Matchcollection MDD = getmidvalue ("<TD", "</TD>", mm. value );
// Foreach (Match m in MDD)
// {
// For (INT I = 1; I <M. Groups. Count; I ++)
// {
// Restult + = M. Groups [I]. value; // Is the result you want
// }
// }

Matchcollection MC = RegEx. Matches (Mm. value, @" <TD [^>] *> \ s *(? <Content> [\ s] *?) \ S * </TD> " , Regexoptions. ignorecase );
Foreach (Match m In MC)
{
For ( Int I =   1 ; I < M. Groups. Count; I ++ )
{
Restult + = M. Groups [I]. Value +   " \ N " ;
}
}
MessageBox. Show (restult );
}