Use a regular expression:
var regex = new Regex( "camel", RegexOptions.IgnoreCase );
var newSentence = regex.Replace( sentence, "horse" );
Of course, this will also match words containing camel, but it's not clear if you want that or not.
If you need exact matches you can use a custom MatchEvaluator.
public static class Evaluators
{
public static string Wrap( Match m, string original, string format )
{
// doesn't match the entire string, otherwise it is a match
if (m.Length != original.Length)
{
// has a preceding letter or digit (i.e., not a real match).
if (m.Index != 0 && char.IsLetterOrDigit( original[m.Index - 1] ))
{
return m.Value;
}
// has a trailing letter or digit (i.e., not a real match).
if (m.Index + m.Length != original.Length && char.IsLetterOrDigit( original[m.Index + m.Length] ))
{
return m.Value;
}
}
// it is a match, apply the format
return string.Format( format, m.Value );
}
}
Used with the previous example to wrap the match in a span as:
var regex = new Regex( highlightedWord, RegexOptions.IgnoreCase );
foreach (var sentence in sentences)
{
var evaluator = new MatchEvaluator( match => Evaluators.Wrap( match, sentence, "<span class='red'>{0}</span>" ) );
Console.WriteLine( regex.Replace( sentence, evaluator ) );
}
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