CODEWITHSUNDEEP
c#regex
Sandeep Sokhal
Sandeep Sokhal

Reputation: 67

How to read a text file using regular expression in C#?

In following code, why is the pattern not matched by the regular expression, but it is properly working if I am reading the 12sep.txt file line by line using regular expression?

string file = @"C:\Documents and Settings\Sandeep.kumar\Desktop\12sep.txt";
string filedta = File.ReadAllText(file);
string pattern = @"^[^\s]+.[^\s]txt$";
Regex rx = new Regex(pattern, RegexOptions.None);
MatchCollection mc = rx.Matches(filedta);

Upvotes: 1

Views: 1271

Answers (1)

Paciv
Paciv

Reputation: 1487

Regex special character "^" and "$" don't have the same meaning when the input string is single-line or multi-line. In single line they mean "string start" and "string end". In multi-line they mean "line start" and "line end".

You have an option in RegexOptions to control this : RegexOptions.Multiline

And the documentation clearly states what it does : "Multiline mode. Changes the meaning of ^ and $ so they match at the beginning and end, respectively, of any line, and not just the beginning and end of the entire string."

from http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspx

Upvotes: 11

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