By 19/12/2013 2 Comments

Search Text with Regular Expression C# Code Example

Regular Expression:

  • a regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. “find and replace”-like operations. The concept arose in the 1950, when the American mathematician Stephen Kleene formalized the description of a regular language, and came into common use with the Unix text processing utilities ed, an editor, and grep (global regular expression print), a filter
  • It is useful for validation on the websites, it force the end-user to enter the correct or valid information (e.g) a valid phone number, an email, name and much more etc

Following example which uses regular expression in c#

string str = "We few, we happy few, we band of brothers..."; // initialize a string

Regex reg = new Regex("we"); // create an object of Regex class and pass 1 parameter from constructor

MatchCollection matchcoll = reg.Matches(str); // assign method into another object

foreach (Match matchVar in matchcoll) // loop through each value
{
Console.WriteLine("{0} at position {1}", // print the result
matchVar.Value.Trim(), matchVar.Index); // call a method
}





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Posted in: C#.NET

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