using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=[\s\.\,\!\?\""\;\:]|^)(?=[A-Za-z']*?[bcdfghj-np-tvwxyzBCDFGHJ-NP-TVWXYZ])(?=[A-Za-z']*?[aeiouyAEIOUY'])(?:[A-Za-z](?:'?[A-Za-z]){2}|(?:'?[A-Za-z]){2}[A-Za-z])\b'?(?=[\s\.\,\!\?\""\;\:]|$)";
string input = @"This regex matches any three letter string that has at least one vowel and at least one consonant. As you can see, it's very effective and it only matches 3 letter words.
The word ""I'll"" should count as a 3 letter word. Words like ""isn't,"" ""you'dn't've,"" and ""let's"" shouldn't. Jo's dog is smart. The quick brown dog jumped over the lazy fox.
The qis' house. ""qis'"" is just a made up word to test stuff like ""kids'"" but for 3 letters.
asd
'asd
a'sd
as'd
asd'";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx