How to get value after keyword using regex ?

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Hi, I have a string with some keyword and values follow. I want to get value after keyword using Regex. For example in this case. I want to get values of class and student.

KEYSTRING
<Tag
  <A "SCHOOL">
  <Tag
    <Tag
      <A "CLASSID">
      <A "A01">
    >
    <Tag
      <A "STUDENTID">
      <A "SB1234">
    >
  >
>.

I want value ClassID is <A "A01"> and StudentID is <A "SB1234">
I have tried this regex, but the result not pretty.

Demo regex

What I have tried:

I tried with this Regex

var _matchClassID = Regex.Match(_str.Replace("\r\n", ""), @"\<A ""CLASSID"">(.*?)\"">");
var _matchStudentID = Regex.Match(_str.Replace("\r\n", ""), @"\<A ""STUDENTID"">(.*?)\"">");
//// I want value like this 
//// ClassID is   <A "A01">   and StudentID is   <A "SB1234">

Posted 5-Aug-23 1:37am

headshot9x

Updated 5-Aug-23 2:51am

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PIEBALDconsult 5-Aug-23 11:12am

If the string is XML, use XPath.

2 solutions

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OriginalGriff · Accepted Answer · 2023-08-05T01:50:00

Try this:

string regex = "(\\<A\\s\"CLASSID\"\\>.*?\"(?<ClassID>.*?)\").*?(\\<A\\s\"STUDENTID\"\\>.*?\"(?<StudentID>.*?)\")";
            string input = "KEYSTRING\r\n<Tag\r\n  <A \"SCHOOL\">\r\n  <Tag\r\n    <Tag\r\n      <A \"CLASSID\">\r\n      <A \"A01\">\r\n    >\r\n    <Tag\r\n      <A \"STUDENTID\">\r\n      <A \"SB1234\">\r\n    >\r\n  >\r\n>.";
            Match matched = Regex.Match(input, regex, RegexOptions.Singleline);
            if (matched.Success)
                {
                Console.WriteLine($"{matched.Groups["ClassID"].Value}:{matched.Groups["StudentID"].Value}");
                }

headshot9x · Accepted Answer · 2023-08-05T02:51:00

Solution 2

Oh, After look at some idea from OriginalGriff. I try spend more time to debug and get like this. Demo link . By the way, all option probably working fine.

var _matchClassID = Regex.Match(input.Replace("\r\n", ""), @"\<A ""CLASSID"">.*?(\<A "".*?"">)");
var _matchStudentID = Regex.Match(input.Replace("\r\n", ""), @"\<A ""STUDENTID"">.*?(\<A "".*?"">)");

Posted 5-Aug-23 2:51am

headshot9x

Comments

PIEBALDconsult 6-Aug-23 16:31pm

Please don't try to answer your own question, just use the Improve question button to add detail.