Asp.net: several issues that should be paid attention to in the RegEx. Match Method

I. Overview

RegEx. Match Method

Search for matching items of the regular expression in the input string, and return the exact result as a single match object.

Reload list
(1) Search for the regular expression match specified in the RegEx constructor in the specified input string.

[C #] public match (string );

(2) Search for regular expression matching items in the input string from the starting position of the specified input string.

[C #] public match (string, INT );

(3) search the regular expression match provided by the pattern parameter in the specified input string.

[C #] public static match (string, string );

(4) Search for a regular expression match with the length of the specified input string from the start position of the specified input string.

[C #] public match (string, Int, INT );

(5) Search for the matching items of the regular expression provided by the pattern parameter in the input string (the matching options are provided in the options parameter ).

[C #] public static match (string, String, regexoptions );

II. Application Example

1. The followingCodeTo retrieve the title attribute of a webpage

Match titlematch = RegEx. Match (filecontents, "<title> ([^ <] *) </title>", regexoptions. ignorecase | regexoptions. multiline );

Filetitle = titlematch. Groups [1]. value;

Note that the groups index obtained by the Red 1 and RegEx. Match Method starts from 1 instead of 0.

 

2. The following code is used to retrieve the "content" attribute of the webpage header.

Match descriptionmatch = RegEx. match (filecontents, "<meta name = \" Description \ "content = \" ([^ <] *) \ ">", regexoptions. ignorecase | regexoptions. multiline );
Filedesc = descriptionmatch. Groups [1]. value;