try {
Regex regexObj = new Regex("Ciao a tutti", RegexOptions.Multiline);
Match matchResults = regexObj.Match(subjectString);
while (matchResults.Success) {
// matched text: matchResults.Value
// match start: matchResults.Index
// match length: matchResults.Length
matchResults = matchResults.NextMatch();
}
} catch (ArgumentException ex) {
// Syntax error in the regular expression
}