About Regular Expressions

Question

Hello All I want to break the string by using the Regular Expression: String:ALLRAD + !(812_ENGLAND US) Output:(ALLRAD + !(812_ENGLAND)) (ALLRAD + !(US)) Thanks in Advance

Vulpes · Answer

As the output strings are not simple sub-strings of the original string you need several steps to break this down using regular expressions. Try the following which I've tried to generalize so that it can deal with more than 2 strings in the comma separated list: using System; using System.Text.RegularExpressions; class Test { static void Main() { string str = ALLRAD + !(812_ENGLAND US); string regExp = @^(\w+\s*\+\s*(!)?)$(\w+(\s*\w+)*)$$; Match m = Regex.Match(str regExp); string[] split = Regex.Split(m.Groups[3].Value @\s*); string[] output = new string[split.Length]; for(int i = 0; i { output[i] = String.Format(({0}({1})) m.Groups[1] split[i]); Console.WriteLine(output[i]); } Console.ReadKey(); } } The output is: (ALLRAD + !(812_ENGLAND)) (ALLRAD + !(US)) If the original string had been: ALLRAD + !(812_ENGLAND USFRANCEPORTUGAL) the output would have been: (ALLRAD + !(812_ENGLAND)) (ALLRAD + !(US)) (ALLRAD + !(FRANCE)) (ALLRAD + !(PORTUGAL))