Use | to combine different case : Regular Expression « Development Class « C# / C Sharp

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C# / C Sharp » Development Class » Regular Expression Screenshots  Use | to combine different case   using System; using System.Text.RegularExpressions; class RXOptionsApp {     static void Main(string[] args) {         Regex r = new Regex("in|In|IN|iN");         string s = "The KING Was In His Counting House";         MatchCollection mc = r.Matches(s);         for (int i = 0; i < mc.Count; i++) {             Console.WriteLine("Found '{0}' at position {1}",mc[i].Value, mc[i].Index);         }     } }   Related examples in the same category 1. Multiple different delimiters 2. Single space split 3. Multiple spaces, using \"[\\s]+\" 4. Single spaces, using () 5. Single spaces, using new Regex("( )") 6. Position and index 7. Regex and letter case 8. ((an)|(in)|(on)) 9. Gr(a|e)y 10. Define groups 'ing', 'in', 'n' 11. Leading space 12. Proper case match 13. IP address 14. Multiple spaces, using \" \" 15. Use regular expression to replace chars 16. Use regular to replace strings 17. Use regular to replace word 18. Use regular expression to replace first 3 digits 19. Use regular to split string 20. Validate first name and last name 21. Validate address 22. Validate city name 23. Validate ZIP code 24. Validate Phone Number 25. Use regular to verify a date 26. HTML Parser