Tuesday, November 6, 2007
Highlighting matches using Regular Expressions in C#
Below is sample code on how to find matches to a particular regular expression in some body of text and surround each match with some html tags.
For example, if the body of text is:
string body = "This is just a test and is the body of text that we are trying to search";
After calling HighlightExpression(body);
body will be
This is just a <span class="highlight">test</span> and is the body of text that we are trying to search
public string HighlightExpression(string body)
{
try
{
string expression = "test";
body = Regex.Replace(body, expression, new MatchEvaluator(HighlightUrls));
}
catch (ArgumentException ex)
{
// Syntax error in the regular expression
}
}
// this is a delegate that gets called for each match
public string HighlightMatch(Match m)
{
return "<span class=\"highlight\">" + m.Value + "</span>";
}
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